Rose Mallow Seeds (Heirloom)

The rose mallow is a beautiful shrub with clumping stems that grow three to six feet tall, depending on the variety. Because of its upright growing style, it is usually referred to as tree mallow. Heirloom rose mallow seeds, which are native to the Mediterranean, have naturalized and now grow wild over most of the United States. This plant is an eye-catcher with its tropical-looking vivid pink petals that bloom throughout the summer and bring pollinators like hummingbirds to the garden. Rose mallow also makes a wonderful cut flower.

In colder areas, where it is cultivated as an annual, heirloom rose mallow seeds can be directly sown in the garden in early April when a little frost is still present (zones 4 through 6). Seeds may be planted in the fall and blossoms can be seen in late winter and early spring in warmer climes. In zones 7 through 9, rose mallow can be grown as a perennial, although it will need to be replanted every five years or so. Because these plants' roots are so delicate, they don't like to be transplanted. But if you must start seeds indoors, start six to eight weeks before the last frost date.

Seeds should be soaked for 24 hours before planting. Germination can be aided by nicking the seeds with a sharp knife or other abrasive tool. Seed in three to four groupings and thin after germination. Seeds need sunshine to germinate, so don't cover them. Depending on the soil temperature, germination might take anywhere from 15 to 30 days.

Heirloom rose mallow loves full sun but appreciates some afternoon shade in the summer. These plants thrive in a wide range of well-drained soil types, including nutrient-deficient soil. When the seedlings are about four inches tall, trim out the weakest seedlings to 18 to 24 inches between plants if direct planting. Drought resistant, heirloom rose mallow prefers frequent watering throughout the establishing period and during hot, dry months. Aim for a weekly watering of around one inch. Deadhead to ensure a steady supply of flowers throughout the season. Rose mallow can self-seed in warmer climates.

For more information about planting, growing, and caring for heirloom rose mallow seeds, see the target="_blank">Rose Mallow Seeds Planting Guide.