I have some large, undivided clumps of daylilies that still bloom well.
A few are just now starting to bloom.
Sunset's "Western Garden Book" indicates that they should be divided
once in 3-6 years. Mine are at the 6-year mark. I might divide them
Flowering plants need phosphorus in the soil. Since this nutrient does
not dissolve well or leach through the soil, it must be placed where
roots will find it. Take a length of 1/4-inch steel rebar. Poke it
into the ground at least a foot very close to a clump of daylilies and
then remove it. Fill the hole with bone meal or superphosphate. Repeat
around the clump for 3-4 holes.
If you divide a clump, stir a handful of bone meal into the bottom of
the planting hole. Before you set a division, sprinkle a little plain
soil above the portion with the bone meal so that the disturbed roots of
the division are not in direct contact with the bone meal.
Sunset says to divide in the early spring or late fall in my climate.
In cool-summer areas or areas with short growing seasons, divide in the
David E. Ross
Climate: California Mediterranean
Has the area become more shady over the years as trees have
grown? (This is a common problem as landscapes mature.)
Daylilies flower best with full sun.
If they are still getting plenty of sun, then the answer would
probably be to divide the clump and amend the soil to improve
fertility. Phosphorous being the key nutrient, as David mentioned.
Pat in Plymouth MI
"Vegetables are like bombs packed tight with all kinds of important
Maria, you got good advice already from others. I will just add the
remark that most daylilies bloom only once each year. The exceptions
are so-called rebloomers. Do you have rebloomers? They need even
more phosphorus than regular daylilies.
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