m0useanswered grow question 2 years ago You tend to switch to flower nutrients when the plants enter flower or start to stretch.
If you plans did not stretch to much, you can tell when they are in flower by the grouping of pistils from the flowers.
I would switch to flower nutrients now giving your plants are in flower.
I have had some plants stretch a lot and some not a lot. Mainly because I used heavy LST and the stretch I though was normal growth. If I let them grow like normal Christmas tree style growth I can 100% see the stretch.
In short, your plants are in flower now, you should be using your flower nutrients now, not all plants stretch the same, maybe they where shocked into early flower as well by something, Autos are picky buggers at times.
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Best Of Luck!