There are many varieties of lavatera mallow available including annuals, perennials and biennials. The attractive pastel flowers appear from spring until frost, depending upon the type of mallow planted. This plant grows from 2 to 6 feet tall and does best in full sun and soil that is well-drained. The seeds can be sown directly into the garden or in peat pots. Michigan State University Extension advises sinking peat pots in the ground along with the seedlings at planting time to prevent problems that often occur when transplanting lavatera mallow.
Fill peat pots three-fourths of the way with potting soil. Plant the mallow seeds and cover with 1/2 inch of soil. Water until the soil is moist, but not soggy and place the pots in a bright location that maintains temperatures of about 70 degrees F.
Transplant the seedlings to the garden once all danger of frost has passed. Plant the peat pots at a level that allows the top of the pots to be covered completely by soil. Water until the soil feels very moist.
Continue to water regularly, any time the top of the soil feels dry to the touch.
Fertilize in spring with a general purpose fertilizer.
Clip off the spent flowers regularly to encourage a longer bloom cycle. Remove any dead or damaged foliage as necessary to maintain an attractive appearance.