How to grow Yellow Flag Iris

Remove the old flower heads to conserve the plants energy when seeds are not required
Divide established clumps every four years or so to keep the plants growing strongly

Can be grown from seed but easier and quicker to divide an established clump in the late summer or autumn after flowering

Transplant in early spring after last frost, or after dividing an established clump in early autumn

Wait until seed pod turns brown, then cut the stem and collect the heads into a paper bag. Continue to dry the seed pods on a warm windowsill, until they split to release the seeds.

These estimates for how long Yellow flag iris takes to sprout, grow and harvest are from real observations from real gardeners, right around the world.

Its specific epithet, meaning “false acorus,” refers to the similarity of its leaves to those of Acorus calamus, as they have a prominently veined mid-rib and sword-like shape. ¹

Used to decontaminate heavy metals from drinking water

Yellow water iris, Yellow iris

Iris pseudacorus L.

¹ http://en.wikipedia.org/wiki/Iris_pseudacorus