This will ensure the production of continuous blooms throughout the growing season. For best results, prune or cut flowers as they bloom. Ageratum is a vigorous plant that does well throughout the entire warm growing season. Plants should be placed in the ground after the last frost date in spring or anytime during the spring, summer or early fall growing periods. Transplants may be started a few weeks before the last frost date in spring, but can also be grown anytime throughout the warmer months. This flower variety grows great in our heavy-duty seed starting trays with Black Gold Seed Starting Mix. These seeds are pelleted, which makes them easier to singulate and ensure that only one seed is placed in each seed tray cell. We recommend transplanting Ageratum Blue Horizon for best results. They are also long-lasting and hold well once cut and given adequate water. These fuzzy flowers have long stems that make them perfect for bouquets and bundle arrangements. Ageratum Blue Horizon produces bluish-purple flowers that grow in bunches which are 2-3″ in diameter. Stems reach a maximum height of 30″ and provide a dense ground cover for shading any new weed growth. This hybrid variety produces tall, sturdy stems that are multi-branching. Beneficial insects can drastically improve the health and vigor of your vegetable garden, as they will increase pollination and reduce the populations of harmful crop pests.Īgeratum also makes a great filler for bouquets with larger flowers. It works great when planted among vegetable plants as it attracts beneficial insects and loads of bee and butterfly pollinators. Ammonium Sulfate Fertilizer Menu ToggleĪgeratum Blue Horizon is a brightly-colored favorite for vegetable gardeners and cut flower growers.Vegetable, Flower, Fruit and Ornamental Fungicide.It is reported invasive in Australia and South Africa and neighboring countries (Swaziland, Mozambique and Zimbabwe) where it poses a threat to biodiversity. It is reported to be a weed and invasive outside its native range, due to its high production of small seeds with easy dispersal by wind or water. Ageratum houstonianum species is native to Mexico and Central America.Alternatively, seeds can be sown in the garden after the last frost date. Easily grown from seed, starting indoors in late winter and transplanting outdoors after the danger of frost has passed. Root rot may occur in poorly drained soils. Excellent choice for beds and borders, edging, city gardens, cottage gardens, containers.Provide consistent moisture throughout the growing season. Appreciates some light afternoon shade in hot summer climates. Performs best in full sun in rich, moist, well-drained soils.Because of its short stature, it is best used for edging or borders of beds, in rock gardens, or in containers. Attractive to butterflies, the blossoms are borne on sturdy stems and float above the foliage of mid-green ovate leaves. across (7 cm), from late spring to frost. Noted for its long blooming season, Ageratum houstonianum 'Blue Mink' (Floss Flower) is a compact, clump-forming, half-hardy annual boasting fluffy powder-blue flowers from late spring to frost. One of the tallest, Ageratum houstonianum Blue Horizon (Floss Flower) is a frost-tender annual boasting fluffy lavender to purplish-blue flower clusters, up to 3 in.
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