Astilbes are very beautiful plants that bring color and texture to shady parts of the garden. They produce masses of attractive fern-like foliage, and elegant plumes of feathery flowers appear from late spring through the summer months. Astilbe seedlings can be purchased in Armenia for 4,000-5,000 drams.
They come in a variety of sizes, from small plants to tall varieties up to 2m tall. Astilbes combine well with some other shade-tolerant plants such as hostas and rogers.
Common Types
Hybrid astilbe (Astilbe×arendsii). This is by far the largest group of garden hybrids, with over a hundred varieties. Most of them bloom early in the season—in late spring or early summer.
When to Plant
In spring, after the danger of severe frost has passed, or in early to mid-fall.
Where to Plant
Given Armenia’s climate, astilbes are best planted in partial to full shade to prevent leaf scorch.
Soil
All astilbes, even the more drought-tolerant varieties, prefer cool, moist soil rich in organic matter. Keep the soil evenly moist but not soggy, especially in winter when the plants are dormant. Avoid planting in heavy clay soils or poorly drained areas. If necessary, amend the soil with compost or organic matter to improve structure and water retention.
Water and Fertilizer
Astilbes are moisture-loving plants that require ample feeding during the growing season. Water the plants well, especially in the heat of summer. A single application of a granular, slow-release fertilizer before flowering in spring should be enough to satisfy their appetite. Early-blooming varieties of astilbe produce buds in the fall for next season’s flowers, so re-fertilizing these plants in October with a high-nitrogen fertilizer will help encourage bud formation the following spring.
Mulching
To conserve soil moisture, mulch well with leaf mold, compost, or another type of organic material. If you notice root crowns rising above the soil, gently press them back into the soil before fertilizing.
Pruning
Don’t worry about removing spent flowers, as your efforts will not encourage repeat blooms. Leave flowers and seed heads to dry on the plant, or cut flower heads fresh to add height and texture to indoor arrangements. If foliage is shriveling and browning after a long period of drought, it can be cut back to the ground to encourage new foliage later in the season or next spring.
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