Remove weeds from the planting site, which should be located in an area with full to partial sun exposure with at least six hours of direct sunlight. If growing during the summer, plant the bok choy in part shade to prevent the plants from over-heating and bolting. Loosen the soil with a shovel to the depth of 12 inches.
Spread 4 inches of well-rotted compost into the loosened soil. Bok choy does not need fertilizing if the soil in the planting site is amended. Rake the soil smooth and level.
Dig holes only as deep at the root balls with a hand trowel, spaced 6 to 12 inches apart. Smaller varieties, like baby bok choy, are spaced closer together. Remove the bedding plant from the container and place the root ball into the hole. Fill the hole with soil and firm it around the root ball. Plant the bok choy in rows 18 to 30 inches apart.