Hello, you should add more data to get a correct answer. Plants in the last stage of flowering generally fall over due to the weight of the buds. When they can no longer stand upright, it's best to tie them up or use stakes. Likewise, you should check the feeding since the older (larger) leaves show some signs of potassium deficiency. If you are fertilizing, be careful not to block the roots, and if you are not applying flowering fertilizer, start increasing the dosage! Also, be careful with watering. If you water too much, they also take in a lot of water and become "heavy.