1st time grower needs help!

My plants have been growing for 2.5 months. They are streched about 15 inchs. Over night my leaves turned droopy on all my plants and the bottom leaves started turning yellow. My soil was pretty dry so i watered right away. They look a little better today but still really droopy at the top with skinny sad looking ,but green, leaves. The top half of my stems are turning purple on some plants. Anybody have an idea of what's going on? I just started the flowering cycle.

Overwatering will make the leaves droopy. When a plant starts to flower it will concentrate more on the top part of the plant thus the bottom leaves are not a priority.Especially the original germinated leaves on the bottom. Don't worry bout them. If your fan leaves are healthy,stems healthy and roots healthy then I think you're fine. Then again I am pretty stupid compared to some ppl here. Jus my 2cents

pics are a must for this type of question. but a nitrogen definciency creates yellowed leaves. so can magnesium (yellow and brown spots) and rootbound. my bet would be nitrogen. check the growFAQs in the plant problems/abuse section for pics to relate to.

What is rootbound? I just replanted today into a bigger pot. The roots were all over the place, it definatley needed a transplant. Give it a few days and hope it comes through...