Notice: Undefined index: department_id in /var/www/vhosts/grotec.co.uk/httpdocs/show_topic.php on line 28

Frequently Asked Questions in General

can i use biobizz light mix soil from seedling to finished plant i have heard u have to transplant to biobizz all mix after about 3 weeks the type of plant im growing is not meant to be transplnted what is the truth thankyou

\n Yes this soil is fine from beginning to end you would need to start adding nutrients after around 2weeks.
how long should i leave seedlings in nursery

\n I would advise leaving seedling in the nursey till you have at least 3 set of leaves then begin to harden them off
Hi do the fans live inside the grow tent ??

\n You can put the fans inside or outside the tent depending on what you need. Be aware if you put your inlet fan inside the tent it will take up some rooom on the floor.
whats best way to clean drippers from salt build up

Liquid oxygen or drip clean or d block depends if you want to use it with feed or at the end. For more information on any product you can type the product name in the search bar at the top of the website.


\n

          

hi im using oxy pots and was wondering how many pots you should have under 600w hps lamp
9 pots would work best. 
whats normal delivery method and tim
Fedex two to three working days
Hello. My plants are in coco, and I am about to start the final flushing phase. Should I do this with just water, or should I add anything to the water. I have cannaboost, pk-13.14, coco a and b, and cannazym.
Just water or flush if you need a feed scedual available in help and advice under nutrients.
why heat nutrients
If you keep your nutrients at the optimum temp it helps the plants take what they need.            
\n
do you do next day delivery
Next day delivery available on request mon to thurs, please call 01706 750 293
When growing plants under a 600w dual spectrum lamp would it be benificial to add a single 150w 27k cfl during the flowering period?
Not much may help to boost a dark corned            
\n
Do all lights need a ballast
All sodium lights need a ballast            
\n
how many grows can i get from 300w dual spec bulb
About 9months for the average dual spec bulb although i have not yet seen a 300w may be its 400w             
\n
delivery
3 to 5 working days unless otherwise requested.  Free UK delivery over £50 
\n
Do you ship to other countries then the UK

\n the cost to ship 3 e.f 230 \'s to Denmark would be £65.00
when use bud blood
you use the Bud blood in the first 10 days of flower.
do u do half meter tents

Not in stock but would be happy to order them in for you if you need a certain size. ( 3 to 5 days for delivery)

hi could you put together a 48 plant setup in a 3x2x2 grow tent
Yes
Im a 1st time grower of tomatoes. They are only 2 days into veggie i have them on 15mins on 15mins off for water. When will i increase the water and to how much ?
WHat system are you in and what medium? Give us a call we will give you some pointers            
\n
leaves drying out
To hot prob light to close 
when do you give your plants bat guano
For best results mix it with your soil before planting.            
\n
whats best temp for nutrient tank plz
22-25c
What is the optimum size of heater for 20 litre nft tank.
100w
what size heater for 60 litre NFT tank
150W heater
what size heater for a ntf 47 litre tank
100W heater
2 week in flowering what is best temperature and humidity should be when the light is on and when lights go of at night ?
You should keep your temperature at between 23c and 30c throughout and a humidity of no higher than 50%
do the carbon filters eliminate the smell totally
Yes as long as the humidity is not to high. if in doubt oversize your fllter so it is bigger than the fan and use a reducer to conect it.
can i mix my nutes and leave then in a covered bucket with air pump atached or does the bucket have to be opaque

Yes store in dark place and airate regularly or constant (Opaque water storage tank is useless unless you are growing algae)
3 weeks in on soil my temp is 19.9 to22 hudmity at 50% is this ok plants look ok

Yes that all seems ok but knowing the temp in the room would be more usefull than the temp of the soil
what height should i hang my 300w cfl away from my seedlings
10 to 20 cms away.
how far away should the hps be from the plant
Around 18inches  (30 to 40 cms) 
do the grow tents hold the heat inside so you dont have a heat signature
No you have to use extractor fans to keep the tent cooler            
when in 12/12 do you needtotal blackout
Yes
my plants have been in 24/7 four four weeks when do i change to 12/12 .
When they are between 12 and 18inches tall
how safe is ordering online to prying eyes


 We have never had any requests for information to any third parties to date.


However if you are concerned about security when you order you can opt to pay the cash into at any HSBC bank using the order number as your reference this allows you to send the goods to any name at any address.

4x 55w proagation lights how long b4 bulbs need replacing.?
They will last a couple of years you will see them fade and flicker when they are old 
is it best to use 1 600w hps to 1 plant for best results

            We would recomend betweeen 4 and 12 plants per 600w light
do you need to use an oscillating fan for better results
Yes they help to strengthen younger plants and reduce humidity in late flowering as well as cool the place down a little.            
is a hydroponic set up any better than hand watering also do you get better results from hydroponics
Generaly its easier and quicker
are cfl lights as good as hps

No Hps are better except for the vegetive growing stage where HPS is the wrong spectrum and to hot
over ferterlised ! do i use canna flush?
Yes , also can be used for the last two weeks          
what fan size intake and out take 5mx5m and 8x600w lights
You should use 10\" fans in and out.
stop autopots flooding
Use a valve cover
I am doing my first set up with a 80x80x180 how many plants should i put in? I am thinking of using 250w hps with cool tube
you could fit upto 6 plants depending of thier size.
can i use a 600w dual spectrum bulb and a shade for cuttings? temp 24 degrees and humdity at 50%
You will get away with it but they will be slow to develop a cuttings light and a humiduty of 70 or 80 % would be better            
my temperature is 21 degrees and humidity is 40% is this ok? how would I bring humidity up?
Reduce fans so temp rises to 25 to 28 and that should bring your humidity up to 50 or 60%            
how many 600w lights could you run from home.


You can run 8 on a standard 32 amp ring more if they are digital.


8 lights is equivilent to an electric shower or two 3kw heaters in power consumption

what is the quitest 6
Airforce accoustic fan would be best 
are led lights any good and are they cheaper to run


We would only recomend Led lights for vegi growth (chipset 6400k)


There are many available on the market that claim to be sutiable for flowering however tests have shown they are far from ready.


We have a close working relationship osram and who are running tests in commercial greenhouses, you can be sure that as soon as we find a viable alternative to sodium we will introduce it to the mases. 

How do you create humidty without humidifiers and misters ?
Reduce light intensity if plants are very young or control intake and extraction better in order to alow the humidity to build (recomend fan speed controler)            
do 600w lamps use much power
cost around Â£10 a week            
Can I spray the plants with the feed mix up until... flowering?

Yes but use a lighter feed in the spray than you water them with. (recomend formulex)
SMS Twin Fan Temperature & Speed Controller would it make my 6
Probably TT fans are crap 
Hi i am a first time grower. My crop isnt the greatest but it is ready and i have started flushing my tomatoes are not any great size but will still get bigger or is that that?
No what you see is what you are going to get.
my plants are from seeds can I take cutting from thems
Yes when they are big enough            
My plants are in the last 3 weeks of flowering but my temp is about 62 degrees with the lights on is it worth while putting another light in ?
yes
Whats the cheapest 600w light kit (full) and what bulb is it with ? thanks
£70 there are a choice of bulbs available.
How many air cooled hoods connected in series can i cool with a 6

will work with a maximum of 8 lights however would recomend 4to 6 if fan is also being used for extraction
in flower but leaves are turning yellow whats going wrong nft system
You need to do a full system check ( ie tell us the pH, Ec, temp, humid and average % moisture content) with that info we should be ableto advise.          
my grow is 7 week from start the temp an humidity is ok in day but at night humidity is 80.90 iv started leavin fans on which drops it 2 68 whats the most humidity my grow can handle
68% is much better than 80% but still close to being to high and a little over what we would recomend. If you can add another ossilating fan at night and keep an eye on the biggest most dense plants as it will strike there first. Also take off any dying or dead sun leaves as they will add to the problem. 
when i click
Sorry website has been down for 24 hrs should all be ok now 
150mm Insulated Ducting how many meters is it for the £40 pounds
10m
6
Insulated ducting 
What do you recomend is a good aeroponic watering program.
I would try 15 mins every 3 hrs to begin then second week come down to 15 every 2 hrs and then third week 15 mins an hour, week 5 15 mins on 15 mins off. 
Plants didn\'t grow well looked like dead, with yellow leaves. I am takin my seed and I am putting in natural rooting spongs and I root them one week. Then I am taking the spongs and I am puttin in the system with throwing water 24hours,
You need a cuttings light for the first month to allow the plants to become established, a 600w light is to hot and dry for one week old cuttings as this is making your humidity to low for any success
how can I get rid of fruit flies please. tahnks
Pest off or plant vitality plus also cover your water or areas of exposed moisture            
i am on a budget and need a contactor and timer to run 1 light, do you have anything that would suit that?

            Yes A £40 relay its the only way to do it and be safe
The room i keep my grow tent in has started to get mould on the walls. why has this happen and what can i do to stop it coming back??
Exhaust you waste air outside (mould develops in high humidity in darkness)            
my tent is in my loft i have lights on at night they just gone into flower the temp seems ok but humidity is high about 62 how do i get it down lower
62% humid will be fine in early flower just be sure that it does not go above 65% in the latter stages of flower if so more extraction will be required.           
n
hi there is there any solution to reverse this please?
No 
I have had my plants 2 weeks into flowering but the dont seem to be growing very well could you give me some advice as i am a 1st time grower thanks.
Check the ph, the ec , the temp and the humidity, and that they are not over watered.
hello.i have a panda aeroponic 150l and my leaves are getting to be yellow.......water them less hours? Thank you for your answer.
Yes i would reduce the watering by using a segment timer to 15 mins every hour or every two hours. also check pH and ec regularly.
how do you get rid of mould
Mould can be prevented by keeping the night time humidity below 65%, but once a plant has mould its days are numbered.
7 week old plant got a big soft brown patch in the middle
Sounds like mould cut it down and strip it dry it before it spreads. (your nightime humid is to high)            
my plants r ready 4 12 12 now do i give them boost straight away or do i leave it a week
for best results use as soon as you go into flower
i have had my light on 24/7 for nearlythree weeks when should i start turning it off and for howlong

When they get to atound 12\" to 18\" high (30to 40 cms)
using rockwool what is the best additive to use when starting 12/12hrs when still alot of growth to do?
Blood blood but probably best to give them an extra week vegi if they are too small. 
my humidity is rising to 75 when lights are off is that bad
Yes you need some air movement at night or the humidity will cause mould            
what can add to my water for soaking my rockwoll cubes so my seeds get a good start
We would recomend formulex its low cost effectave and can also be used to mist/spray your cuttings as well.            
what soil is best for seeds
We would recomend biobiz lightmix 
my plants r 5 weeks old the temp is 29 and the hum is 7o% my leaves r going yellow but not curling n i feed them 1m of a+b 2 a liter is that right
You can use up to 3 ml per ltr, your temp and humid is a little high try to increase airflow.            
how many aerowings can be connected together with 6 inch fans

I would recomend 3 aerowings in conjunction with your 150 extraction system


or up to 6 if the fans were purley for cooling the lights. 


However most customers prefer cooltubes             

1.2 tent in veg--2x 4
If you 2x4\" fans 1 in drawing fresh air and 1 out venting to outside you should not need to open the doors regularly
I see you highly recommend Plant Vitality Plus to get rid of spider mites. Is this product safe to use at all during flowering? Also, do you have an opinion on the new Canna Cure product for killing mites?


Yes you can use plant vitality plus in flower however we advise caution spraying to late into flower especialy just before the night cycle as you can cause the humidity to increase to dangerous mould producing levels.


As to canna cure the feedback we have been getting is that is not as instantly as effective than the PV+ but it is very popular as a preventative measure as it makes the plant less hospitable to spidermite and their eggs.

What do you feel is the optimal total NPK ratio for use during flowering in a hydroponic setup under HIDs with moderate temp/humidity? Either in liquid nutrient volumetric NPK terms or solid nutrient weight NPK terms.

Our prefered optimum is 4-4-11 with an addition of a pk 13/14 or 9/18 about half way through flower, however this is a matter of opinion as some nutrient companies make their solutions stronger and some weaker.


With the stronger to have to be carefull not to give plants nutrient burn and with the weaker ones you tend to use more so it can be safer but more costly.           

is it bad to give pk 13 14 on the 3rd week of flowering
Week 3 is A little early but it wont do any major harm, some growers do this regularly if lhe plant has a very short flowering cycle.           
plants av yellow spots i use bio bizz an treated em wiv canna cure im a week into flower wots best i can do
Check your temprature humidity EC and pH and you will probably find 1 or more of those things are incorect.
my plants have yellow spots
Study the underside of the leaves for pests,
Have you sprayed them with anything?
have you been feeding them anything?
how many watt are theJupiter II Light Mover
2.5 watts
can removing top of plant improve yield, if so how?
If you remove the growing tips late vegitave early flowering stage it will encourage the plants to develop more flowering sites and spread the plants development between those areas, doing this any later than 2 weeks into flower would not be advisable.
one of my plants has white worm how do i get rid of it, and is it bad for the plant
If its in the soil it is probably springtails it wont have a major effect but get better soil next time not cheap garden center rubbish as it is full of bugs.
can i veg under a 4x55w and if so for how long?
Yes When they are little you will fit 100s of cuttings under when they are more established it will be less (20 to 40) as the spread of light will only cover 1/2m square with intence light.
starting out, do i just germinate my seed then them into root-it cubes in a propagator, do i need to keep the propagator under light? where is best to keep it?
Place the seed in the cubes put the propagator in a warm dark place untill they shoot up then put them under a cutting light.
My plants are 3weeks old in a tent, should i have the light on all day? Do thay need feedin a+b as i just bin givein tem water?
Yes the light can be on all day or for 18 hrs per day your choice. and you can start adding Food (A&B) once they have started rooting.
my plants are 3 weeks old and got spidermite whats the best solution to get rid of them?
Plant vitality plus £18 3 applications. bye bye mites
clone The plants roots have died but plants are still alive should i put them back into a propagater
No just spray with root stim.
from seed my plants 3 week old some of the leaves goin bit yellow and curling what should i do ?
Would need to know your methord of growing and your temps and humids but it could be over watering or under feeding.
my plant r 3 week old from seed what temperature and humidity should it be .
Hi Temp should be around 25 to 28 degrees and humidity should be 60 to 70%
plants are in early veg stage i sprayed them just before lights went out for 6 hrs but i have had the leaves turning light green on some of them and curling up?
The spray should not of effected them unless the pH was wrong, Check temprature humidity and that the feed is not too strong for starters.
from seed how many weeks is it i start to feeding a&b?

As soon as the plant is rooted you can start with a light feed. We recommend either a baby food such as Canna Start or a 1/4 strength dose of you vegiative nutrient.

The EC should be between 0.8 and 1.0

when do youu start feeding your plant

As soon as the plant is rooted you can start with a light feed. We recommend either a baby food such as Canna Start or a 1/4 strength dose of you vegiative nutrient.

 

The EC should be between 0.8 and 1.0

can i leave plants in growroom while smoke bombing
No, smoke bombs will kill anything in the room.
what is the best temperature for flowering
26 degrees in the day and 22 at night
what is the best humidity to grow at
around 65% in vegi and early flowering stage and aprox 50% for mid to late flowering
Re I am 4 wks into flower and some of the leaves are turning light green /yellow down the sidesi a feeding them on coco a and b 30ml plus big bud 30mls roughly taking a litre of water and feed per day also my leaves seem to look very dry any cluesplease
My best guess would be nutrient lock out due to overwarting but to say for sure i would need to know the temp humidity and several other things to make a more accurate diagnosis. (Do you allow the coco to begin to dry out beforte you water again, if not thats your problem.)
i am allmost in the final two weeks of flower but my plants are looking on the small side, what can i do?
Its too late to do anything now just get to the end, and pop in for some advice for the next crop
slow growth in nft
Probably overwatering try putting pumps on a segment timer till roots are established.
Returns policy?
Our full returns policy is on the website under about us.
Re 3 hrs late will it matter
No it will be fine plants measure in hrs of darkness not hrs of light.
HinnDo you do the replacement ceramic plates for these aswell? Im just a bit concerned about shelling out on one and being stuck for refills.
Yes the plates for the fogger are available on the site.
What size pipe is used in the 8 plant wilma system
A 16 mm feed pipe reduces down to eight 6mm drippers
how to get the nutrient level right from week one too week twelve
Get an ec pen or bluelab trunchoen then you can measure the TDS or EC of the water, by doing this you will be able to measure the food strength at each stagealowing you to increase the strength as the weeks pass
how many hours of light should i give my plant during each stage of growth?
Most growers spend a month in vegi on 18 hrs light and 2 months in flower on12 hr light.
how many plants does this tent hold
The number of plants depends on your methord of growing and also the time frame you are working with not just the size of the growing area.
ive bin told u can get rid of thrips by putting a layer of childrens play sand on top of the soil..is this true?? or any other ways to get rid?
Not sure about the sand, cant do any harm so give it a go and let us know, also you could use Pyrethrum 5 EC natural organic insecticide
What can I use to boost yield in soil grown plants?
Use Boost accelarator throughout flower and PK13/14 for a week half way through flower. 
Power 6when are yougetting Dual 00/400w Digital Electronic Ballast in stock
This model had been replaced by the manufacturer for the dimmable 600/400w ballast that is available instore now fo an extra £10
how do i stop my leaves curling up at the edges

This is usually a sign your room is too hot try to cool it down>

If this is mainly on the upper leaves or use a clip fan to cool the air between the bulb and the plant. 

should i cut leaves off plant

Leaves are normaly removed at

at the begining of the flowering cycle to shape the plant

at the end of the flowering cycle when they are yellowing off and are easy to remove

or when more than 50% of the leaf is damaged due to diesese,  or inhospitable enviroment.

some of my leaves are curling up along the edges what causes this
Usually it is a sign of it being too dry and hot, could also be over nutrient if leaves are a very deep green. 
i have tiny ( 1 / 2 mill long ) white things living in my f&d tank, what are they?
Probably springtails they wont do any major damage to your plant.
rox

Rox restricts vertical growth in order to provide a more dense flowering area.

We usually recomend keeping the temp variation between day and night to a minimum which will prevent stretching naturaly.

calcium costam
We dont stock calcium from costam but we have a similar product from canna.
can canna soil feed be used on eney plants

YES

There is a 2 part formulation Terra vega for earily vegi stages and Terra Flores for the later flowering stages.

feed for soil growing
Our 2 most popular feeds for soil growing are Canna Terra Vega and Terra Florres, However we have organic alternitaves available instore
growing seeds in wilma
Seeds can be grown in a wilma although we would reccomend using a heated propagator to start with.
WHAT IS YOUR ADDRESS
393 manchester Rd ROchdale OL11 3PG For full maps and directions see about us section of the website. 
when do you start using boost

Boost is used aprox half way through the flowering stage for 2 weeks However Boost accelerator can be used throught the crop as a growth enhancher.

 

does the hot box kill all thrips
Yes
returns policy
Please see terms and conditions inthe About us section of the website for our full returns policy.
can u use a smoke bomb while plants r in the room
Some brands you can others not please ask instore
how do ozone generators work
It essentialy burns any smell out of the air.
Should reading go up on ec reader when you put your ph in

No EC reads feed and  PH PEN reads How acid or alkalie the tank is.

The optimum pH is Between 5.8 and 6.2 

is it ok if temp drops below 20 degrees wen light is off
It will be ok but it is best to keep as little variation in the temprature between night and day as possible.
can you use monster bloom with any soil
Yes
what is N.F.T
Nutrient film tecnique see other help and advice for expanded explination.
what is ec level
Ec measures electrical conductivity in the water, by doing this it is able to indicate the concentration level of feed (nutrient) in the water
how do you send items out
We use a fedex next day service
getting rid of spider mite

The best thing on the market is for spidermite is Plant vitality plus thatwill get rid in 2 to 3 applications.

Spray safe is also advised for treating new cuttings to prevent any hidden eggs from hatching.  

silence my fans

There are a range of accoustic fans in the ventilation section,

Also insulated ducting will reduce fan noise by between 30 and 60 %.

whats the differance on red and blue cfl lights
The blue CFL is for vegi growth and the Red for supplimental flowering in addition to a sodium.
bud rot

Mold and bud rot usually occurs in the dark peroid when the humidity gets to high for the plants to access oxygen.

Need to reduce your nightime humidity fast before disaster occurs call us.

How often should you feed during growin stage usin flood an drain
Depends on the medium but if in pebbles once a day at first and then increase as the plants a get bigger more developed root system. 
how much light should small cuttings be given

Initaly a 125 cfl or a twin cuttings light will be the best thing for young plants.

And can be used through vegi growth in increasing the intensity as the plants become bigger.

What amps do 600w digital ballasts use compared to 600w magnetic ballasts?
The digitals use aprox half the Amps as the magnetics
How much light should small cuttings be given?
We recommend using some small lights such as CFL bulbs or our cuttings lights. During this stage it isn't a problem leaving these lights on 24 hours
More Help & Advice