Slow Plant Growth

I grow my own seeds. Last year I had a bumper crop. This year my plant grew very short - about 3 feet and are in full bloom. In fact some of the threads are turning red.
The time of growth they were slow growing and had lower yellow leaves. Out of 19 plants I had 8 males. That is way more then I ever had. It was a warmer summer then usual.
The plants are a cross between a sativa and a auto. I know they should have been fast growing but would that also mean short. The sativa was ten feet last year and the autoabout 3-4 feet.

Can people offer me any solutions. Ot does everything seems as it ought to have been?

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A strain can have many different phenotypes. From the same seeds, you may get very tall or very short plants, or many different characteristics. Nothing seems out of the ordinary to me.

As for yellowing leaves, it could be a lack of nitrogen, or perhaps a calcium deficiency, or some other problem. That part is hard to say without more information and pictures.

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@resimax

I had not considered the phenotypes. If there were tall and short, busy and spindlely plants, that might have come to mind. However, the plants are all the same relative hight, and structure.
They remind me of auto, in that they are not tall and matured much faster then the original sativas and auto.s to which I crossed them.

I wondered if the warmer summer then usual, above the 45 parrell, might have stressed the plants and resulted in the high number of males. Normally I get may thre but this year I got about 8.

Certainly weather has a role to imo

__ yes!!! genetics do come in to play ____________ Yea - I crossed an auto (Nirvana) with China Yenem (Ace) and got all sort of seeds; mean they were not stable , every grow was a crap shoot You didn’t do anything wrong – the next seed will probably be a 10 footer happy Breeding

@hawkman
I hope that will be the out. Thank you for the reply, and also resimax.

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