A week ago I transfer these horsetail reeds from their 5 gallon pots bought at my local nursery to these planters. When they were in the pots they were nice and straight. Now, just a week later they are starting to bend and fall side ways, not straight and erect like they were befofe planting. I've been keeping the soil moist. They get about 3 hours of morning sun. No drain holes in the planters, any suggestions would be appreciated. Located in LA, CA.