Gardening Methods

What is a good flowering annual that does well planted under a Magnolia tree?

I have about a four foot sguare garden plated under a Magnilia tree. Every year plants do well until about mid August and then they die off. I don’t know if it is because the tree doesn’t allow enough sun or what my problem is. I’m a pretty fair gardener and othrer areas in my yard do well. Thanks

impatiens

Lawn & Garden Care : Types of Annual Flowers