Thanks Elaine that definitely makes sense. I planted the cannas around the banana to keep a little humidity in the area since mid to late Summer here can be very dry. The cannas were more robust than I anticipated lol. Is it too late to move them now? Last year my banana was by itself but the ground kept dried out quickly despite mulch so I decided to plant cannas around it this year, now I see that it was a mistake. If it lives through the Winter, I'll let it have the flowerbed to itself next year.
