Astilbe is an incredibly popular flower during the time it is in season and available to order from the Dutch flower auctions. We usually see wholesale Astilbe from May to November however sometimes the season can be shorter. The Astilbe flower has branched stems with spiked clusters of soft and delicate flower heads. Astilbe is available in bunches of just 10 stems and a variety of colours throughout the season usually including white, pink and red..