Astilbe x arendsii 'Radius'

Radius Astilbe

Categories: Herbaceous Perennial

A large, impressive looking selection with great impulse appeal!  This outstanding new hybrid forms a large, robust clump similar to A. chinensis types but with more refined (not coarse) green foliage.  The new foliage has a pretty reddish copper cast in the springtime. 

More About Astilbe x arendsii 'Radius'

  • a fast growing...vigorous red astilbe

Leafy, burgundy red scapes carry triangular plumes of burgundy red buds which open to bright red flowers in early to midsummer.

Radius Astilbe Growing and Maintenance Tips

Astilbes are long-lived perennials that are most comfortable when grown in rich soil and light shade to filtered sun. They will grow in full shade, but will not bloom as prolifically there. Though they are easy to grow, Astilbes have one critical requirement--lots of water. Plants must have consistently moist soil; dryness leads to a quick demise, especially in sun. Increase watering as the foliage emerges and the plumes mature. If the soil dries out, the leaves will develop brown, crispy margins and will begin to drop. Fertilize Astilbes in late spring before flowering starts. Wait to cut back the old foliage until spring; it will help protect the plant from winter damage. In the spring, if the crown has risen above soil level, gently press it back into the ground and apply some organic matter around the plant. Plants should be divided in early spring every 3-4 years to maintain vigor.

We do NOT SHIP plants. ALL Sales are in person at our garden center.


20-26 inches


18-20 Inches

Hardiness Zone:


Astilbe x arendsii 'Radius' Characteristics


  • Dried Flower
  • Ground Cover
  • Mass Plant
  • Cut Flower / or Foliage
  • Good for Shady Sites

Critter Resistance

  • Rabbit Resistant
  • Deer Resistant


  • Morning Sun / Afternoon Shade
  • Shade Tolerant
  • Part Sun/Part Shade

Growth Rate in the Garden

  • Medium

Season of Interest (Flowering)

  • Late Summer

Season of Interest (Foliage)

  • All Season

Soil Moisture Needs

  • Average
  • Moist

Fall Color

  • Red

Flower Color

  • Red


  • Spreading
  • Clumping