• the clump needs to be divided; this is best done in/around late July: Cut foliage back two-thirds, leaving a short fan of leaves. Lift the rhizomes and remove/cut off any rot. Using a sharp, clean knife, cut the rhizome, making sure it has some leaf fan and roots attached. Replant, covering with 1/2 inch of soil. If the central portion of the rhizome has no root or foliage, discard it.
• shade on one side causes them to reach for sun and so lean, eventually falling.
• fertilizer high in nitrogen has been provided; this cases foliage growth at the cost of flowers.
There may be a few reasons for this:
• the clump needs to be divided; this is best done in/around late July: Cut foliage back two-thirds, leaving a short fan of leaves. Lift the rhizomes and remove/cut off any rot. Using a sharp, clean knife, cut the rhizome, making sure it has some leaf fan and roots attached. Replant, covering with 1/2 inch of soil. If the central portion of the rhizome has no root or foliage, discard it.
• shade on one side causes them to reach for sun and so lean, eventually falling.
• fertilizer high in nitrogen has been provided; this cases foliage growth at the cost of flowers.