are not heavy nitrogen feeders. Use compost, well-rotted manure, fish
fertilizer, or commercial fertilizers with a low first number (nitrogen)
to amend your soil. Commercial fertilizer with compound numbers of 6-35-10
is an ideal spring tonic. A fall blend of 0-13-18 is ideal for preplanting
rot. You can reduce your risk of soft rot by planting the rhizome in a
well-drained location and eliminating high nitrogen fertilizers.
do not like wet feet.Plant only in
well-drained beds. You can improve drainage by using raised beds, planting
on a slope, or mounding the soil where the iris is to be planted. If your
soil is heavy, course sand, gypsum, or compost worked into the soil will
help to improve drainage.
for leaf spot. Brown spots, caused by a fungal infection, may begin to
appear on Irises in the spring or at anytime the weather is wet for
prolonged periods. Disease pressure is high in May and June. At he first
sign of leaf spot, treat with fungicide approved for use on Irises.
Daconil is and example, mix ratio is 1 Tablespoon per gallon. Repeat every
7 to 10 days as needed.
slugs. Slugs are among the few pests that seem to like Iris. They can do
an incredible amount of damage if left unchecked. Keep area around Irises
clear of garden clutter and dead leaves. A good , rain tolerant, slug bait
applied at the manufactures recommended rate will control these critters
and keep the Irises strong and healthy.
prefer slightly acidic soil. The ideal pH for irises is 6.8.Check soil pH
prior to planting kits can be obtained at most garden stores and often
Extension Services will test soil samples for free. If the soil is acidic
treat with lime. If the soil is alkaline - treat with sulfur.
prefer full sun, but can tolerate some shade. To bloom consistently,
Irises need a minimum of 6 hours of full sun per day.
Irises can be transplanted anytime. Just slip the iris from the pot,
keeping the root ball intact. Be careful not to plant too deep the top
of the rhizome should show.
plant Irises too deep. The rhizome should be planted so the top is visible
and open to the sun. In extremely hot climates or in very sandy soil, the
top of the rhizome may be covered by no more that ¼ soil.
Irises should be planted 12 to 24 apart. For clump effect, they may be
planted 6-8 apart in a circle with the fans on the outside. Spacing
between the clumps should be 2-3 feet.
over water. Occasional deep watering is better than frequent shallow
watering. Do not keep Irises wet it can promote bacterial soft rot. Once
established, Irises are very drought tolerant.
blooming, the stems should be cut off close to the rhizome and removed
from the garden.
green leaves should be left undisturbed. Brown and diseased leaves should
be cut back and removed from the garden.
are at their prime in 2-year clumps. Avoid overcrowding. Irises should be
thinned and separated every 3-4 years.
best time to separate and move Irises is after they have bloomed but
before they begin to set on new growth. July, August and September are
ideal times to transplant.
the fall, the Iris leaves can be cutback into a fan. The foliage that is
cutback should be removed from the garden. This will help to control pests