Does anyone know why these are so short there under a 300w led at about 20inch and the ppfd is around 450 in the centre humidity is at 50% and temp is 27°c, they grow to big plants in a friends grow but they use different type of light source indoorthey about 30 days old. One has been fimed and the smaller one was in a smaller pot till today,,, and the one on the right top set of suger 🍃 are going yellow around the edges
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they look great I would not be concerned about their height. Honestly I would prefer my plants to be short and bushy especially for growing indoors. This summer I grew 5 clones from the same plant half inside and outside at the same time and each plant matured slightly differently
What is the pH and PPM of the soil runoff?
Genetics. Good lighting. If you want more stretch look into kelp extract.