I've grown 2 different strands from seed. One (Northern x BB) has lost its deep green colour and is turning a pale green and the leaves are curling up and down. The other strand is doing well with no problems They broke the soil 2 weeks ago so quiet small.
We are in the middle of a heat wave, do I water more or less? Fertise more or less, reduce light time? How do I fix it and bring it back to its former glory???[/QUOTE
Hi, Questions...In or out grow (sounds like out), frequency of watering currently, what nutrients are being used and how frequently currently, what foliar sprays or additives are being used?
If all the plants are new and you're getting yellowing and curling I'd say the roots are staying too wet. That will eventually drown them, first signs tho are yellowing leaves (lower ones first) The leaf will turn completely yellow, no veins or margins still green. Root zones ought to dry about half way out in general when plants have leaves, soil and, especially amended soils, hold moisture fairly well. Plants will respire (give off water/take up water) quicker when it's hotter, you can still over water tho when it's hot.
If the plants are being fed lots of Nitrogen or are being sprayed with some nitrogen rich foliar spray leaves may curl. Lots of things tho can make leaves curl...including heat.
Happy Gardening, GrowIT!