Ageratum flowers are among the prettiest garden blues, growing well in sun or partial shade, from early summer to frost. Growing Ageratum is easy. So, they are excellent plants for beginner gardeners. They produce a profusion of fluffy flowers all season long. In the fall, the plant will drop ageratum seeds, to reseed the area for next year. Annual ageratum plants are native to tropical regions of South and Central America.
Flower Colors: The blues are most popular, providing a colorful accent. Flower colors also include pink and white.
Their size and color make Ageratum good candidates for both rock gardens and flower beds. Try growing Ageratum plants in containers, too. They will be right at home on your patio or deck.
Plant Height: Compact plants grow just 6-8 in. tall.
Annual, Ageratum houstonianum
Ageratum flowers are grown from seeds. Sow Ageratum seeds outdoors, after all danger of frost. Or, start indoors 6-8 weeks before the last frost date for your area. Cover seeds with 1/8″ of light garden soil, and water lightly after sowing seeds.
Growing Ageratum flowers is easy.
Ageratum prefers full sun to partial shade. They will tolerate a fair amount of shade.
The plants will do well in both average and poor soils.
Space plants 6-8 inches apart. Water well, when planting.
They are tolerant of dry soil conditions. Water the plants when the soil is dry. Keep soil moist, but not wet during dry seasons.
Add a general-purpose fertilizer once or twice a season.
Ideal Soil pH: 6.0 – 7.5.
Plant Problems – causes and cures
The most common insect problem is mites. Most insect problems can be effectively treated with insecticidal soaps and milder insecticides like Sevin.
Disease problems are not very common. If problems occur, treat early with a fungicide.