You should plant new Astilbe plants after all danger of frost has passed. For a young plant establishing its root system, the frost would most likely damage and stunt its growth. We would recommend waiting until a mid to late May to plant, but you can also find the last frost date for your region by entering in your zip code here: http://www.almanac.com/gardening/frostdates/
As you might be able to tell from other questions and responses to this post, Astilbe is a needy plant requiring a middle ground of everything. It needs plenty of water, but not too much; partial sun, but too much and it could burn; and balanced soil with pH between 6.0 and 8.0. Just read and try to follow the guidance from the article above the best you can. Good luck and happy gardening!
Hi Rosanne, excellent question!
You should plant new Astilbe plants after all danger of frost has passed. For a young plant establishing its root system, the frost would most likely damage and stunt its growth. We would recommend waiting until a mid to late May to plant, but you can also find the last frost date for your region by entering in your zip code here: http://www.almanac.com/gardening/frostdates/
As you might be able to tell from other questions and responses to this post, Astilbe is a needy plant requiring a middle ground of everything. It needs plenty of water, but not too much; partial sun, but too much and it could burn; and balanced soil with pH between 6.0 and 8.0. Just read and try to follow the guidance from the article above the best you can. Good luck and happy gardening!