300gph pump work in the 11 plant garden
 

Would a 300gph pump work well in the 11 plant garden?

You probably could fill ten 11 plant gardens with a 300 GPH pump. All you have to do is put at shut off valve between the garden and the pump to slow the flow then it won't matter what size pump you use. As you expand your garden you open up the valve to supply more water to your system.
Ron