First time at hydro: Healthy but slow growing plants

by The Greenman
(From the land down under..)

Ok I have 2 plants from seeds (unknown strains or genetics) in a cupboard in 75mm high pots (plenty of drainage) that have spent a week under clone light and 5 weeks under 400w(globe is about year and a half old) They're growing in a coco/perlite medium using seasol, advanced floriculture roots bloom, A+B Organics base nutrient (made from worm castings) and Natures own Supergrow (bat guano). The nutrients are made up in one week batches (ph 5.5-6.0 and EC 0.7 at this stage, not including tap water EC) in a large tub with a fish tank heater set at 22 degrees, also using an airstone 24/7 to aerate. Running an extraction fan to carbon filter 22 hours a day, with plenty of air intake. Day temp is between 20-27 degrees, night time 15-10 degrees. Not sure about humidity. I started weak nutes after 1 week old (EC 0.3-0.4) when i saw the first set of true leaves. To start with for the first 4-5 weeks I was flooding the medium once a day with nutrients untill i realised I was overwatering, now only flood every second day when top of coco is dry 1-2 inches down. At 6 weeks old (before tipping) they have 8 nodes and are 7 inches tall with thick stems and literally heaps of new, slightly mutated (i put this down to seasol and guano, amazing shit lol) but otherwise healthy and bright green foliage (one darker than the other, probably different strains) with some purple stems. Top fan leaves have 7 fingers. Have had one case of nute burn which i fixed by flushing pots and adjusting nutes, and one case of light burn (raised light to 12 inches) which will have set them back a little, but I would like to know if they are smaller than should be expected and if they sound healthy overall and what I can possibly do to improve growth? Any feedback will be greatly appreciated. Ps am interested more in horizontal growth than vertical and have just topped the first node. Also will be buying a heated induction fan next week to help regulate night temp to 22 degrees.

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Answer from Stella/Simon:

Hi Greenman,
Just a few thoughts that came to me as I read your submission.

1. Sounds like you might be complicating your nutrient mix by using too many brands. Why not try just one, follow the bottle directions carefully, check with EC meter and change often.

2.I don't think you are overwatering. If you're using hydroponic media, which it sounds like, try flooding the plants 2 times daily for a while.

3. Your lamp, you didn't say if it was a metal halide. MH bulbs should be changed yearly, so if that's what you have, it may well be inadequate to support plant growth.

Just some quick thoughts, invite anyone else to chime in.

Good luck with your Hydro project!

Hope this helps!

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Comments for First time at hydro: Healthy but slow growing plants

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Jun 19, 2013
Questionable
by: MeMwl

? What are you growing ?
There is now way to tell until you tell what you are growing, different plants need different environments
BTW I am a master Gardener(arizona)

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