How Deep Should Soil Be for Hostas

Dig a hole, at least 12 inches deep and 1½ times the size of the mature plant. Mix in a 2- to 4-inch layer of organic matter. Carefully remove the plant from its container.

How deep do hosta roots go?

With really large plants, roots may extend up to 18 inches deep. Once the plant is out of the ground, slide it onto a tarp. This protects surrounding plants or lawn from being inundated with soil falling off the hosta root system.

Can hostas grow in shallow soil?

Hole Preparation: Hostas do not grow deep into the soil, usually no deeper that one shovel depth or so. Wide holes are better than deep holes, since hosta roots usually extend as far or further from the center of the plant as the foliage does.