Lack of trichomes

I have 3 different autoflowers, one of the types is loaded with trichomes. Seems like it happened in 48 hours. The other two hav not put on any at all. What can i do to stimulate them.

More dark hours build triches along with the right mix of sugars, light magnitude and implementing cold weather scenarios; ie, colder night temps, colder water feedings and ice cubes.

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