Spend a good amount of time in any hydro shop across the country and you’ll hear all kinds of different questions related to growing plants hydroponically. But you’ll start to see some patterns forming, too. Here are 10 questions heard over the years working in an indoor gardening store.



How often should I empty and replace my reservoir and nutrient solution?

What is the difference between organic and inorganic fertilizers?

Which nutrient supplements can I use to increase flower size?

What is the ideal growroom temperature?

What is that scum in my reservoir? And how do I prevent and get rid of it?

How often should I replace my HID light bulbs?

What are the benefits of growing with hydroponics?

What is powdery mildew and how do I prevent and treat it?

Why are my leaves turning yellow and what can I do about it?

How do I know if I have spider mites? And how do I purge them from my plants?