The Secret to Stunning Petunias

White petunias in a huge pot are taking over.

ExDancer

My neighbour always has a stunning display of hanging baskets filled with petunias. When I asked her to share her secret she said she never deadheads them, just gives them a good dose of tomato fertiliser once a week.
Surely she must be pulling my leg?
My husband insists she must go to the garden centre and buy new every couple few weeks!

I suspect she also has a system to drip water them daily. We do.

I worked on the tube ends today, reminded me to this thread.