Plant in full sun if possible, but they will bloom with a
minimum of a half-day of sun.
They prefer soil with a pH of 5.5 to 6.9 (slightly acid)
but tolerate pH 4.5 to 8 if other conditions are suitable.
They grow well beside water - not in it (good
drainage is critical) - and are equally at home in the perennial bed.
Plant with tops of rhizomes 1 to 2 inches below the soil
surface. Space plants about 2 feet apart.
When transplanting, roots must stay moist while plants are
out of the ground! Keep roots wrapped in damp newspaper, etc. until planted.
After planting, water as required to keep the soil moist -
at least one inch a week. After they are well established (usually two to three seasons),
they withstand drying as well as most other herbaceous perennials.
Fall planting is preferred but not mandatory in the
Louisville area IF they are watered well during the summer they are planted.
Mulch them heavily (aged wood chips, shredded cypress
mulch, etc.) the first winter they are planted to prevent heaving. After they are
established heavy mulching is not necessary.
A light application of 5-10-10 fertilizer is spring is
suitable but not mandatory in good garden soil.