When to plant Astilbe?

Astilbe thrives in partial or full shade, making it ideal for borders under trees, woodland gardens, or any spot that doesn't receive strong midday sun. It tolerates a range of soil types—loam, clay, or peat-based soils—but the key requirement is moisture retention. Before planting, dig in plenty of organic matter such as well-rotted compost or leaf mould to improve structure and water-holding capacity, especially if your soil is on the lighter side. Plant astilbe in March, April, May, September, or October. Autumn planting gives roots time to establish before winter, while spring planting works well if the soil isn't waterlogged. Dig a hole slightly larger than the root ball and set the crown so it sits just below the soil surface—burying it too deeply can lead to rot, while planting too high may expose the roots. Space plants 45 cm apart to allow for their mature spread of 30–60 cm. After planting, water thoroughly to settle the soil around the roots and eliminate air pockets. Astilbe has high water needs, so keep the soil consistently moist, particularly during the first growing season. Apply a 5–7 cm layer of organic mulch such as bark chips or compost around the base, keeping it clear of the crown itself. This mulch conserves moisture, suppresses weeds, and adds organic matter as it breaks down. Staking is not necessary; astilbe's sturdy flower spikes hold themselves upright even in shade. Check soil moisture weekly during dry spells in the first year.