Years ago when I grew in containers I put newspaper in the bottoms it worked very good at keeping the water and fertilizer from washing out.
Saucers also help.
One problem with containers is they use one heck of a lot of fertilizer.
More than would be expected.
One way to help keep from washing out is to use a granular on top.
Your choice I have no recommendations they are all about the same to me brand wise.
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