I dont think your watering enough, you need to give more than 1/3 c of water when the leaves droop, you need to start watering more, water til the water drains out the bottom and let it sit in the sink until it is finished draining, waiting for it to droop is not a good thing, also your fertilizing to often. If you could also state your zone or location that will help us to help you. Other members will have more advice for you
To The Forum