The type of container you choose for a particular plant can help it thrive or stifle it. Growing containers vary widely in size, shape, material, and drainage. All these factors contribute to the resulting engineered environment for a plant.
The growing medium going inside the pot will be affected by your container choice and the plant living inside. At ALCLA Native Plants we prefer plug containers which encourage a deeper, more developed root system to help our plants succeed as they are planted out into various environmental conditions.
The photo below highlights the size of a plug container next to the same species of plant grown out in a bed from that container size after one year. This container holds a well-developed root system which helped this Blanket Flower take off after planting.