Ageratum Doesn't Have to Be Tricky To Grow
Ageratum is one of
those annuals that if you can grow it, you can be the envy of the
neighborhood. And I understand that some folks have problems
with this lovely blue flower so here are the tips for success.
USDA zone 4/5, plant seed from late February through March and you'll
be fine for timing and blooms in early June.
seed requires light to germinate (that's where a lot of you go wrong)
so the trick here is to pat down the soil, and lay the seed directly on
top of this firmed soil.
the seed to ensure it is in contact with the soil so when you water,
you won't wash the seed down the side of the pot (where they seldom
Use a warm soil
temperature of at least 75F, 80F/27C is much
Seeds should be up
in 7 days. Note that if you try to germinate this
seed in cool soils, it will simply rot away.
use warm water to water this plant. I hope you're
getting the message that this one likes to be warm and doesn't like
cold in the seedling stage.
Once you grow it to
the 4-leaf stage (it has 4 true leaves) then you can transplant it into
its own pot or cell in a pack. Then you can drop
the growing temperature down to 60F/16C.
this too is important. Once the plant starts to mature, it
won't like warm temperatures but prefers the cooler growing conditions
(still use warm water to irrigate).
Plant outdoors after all danger of
frost; although I note that this plant if acclimatized and has been
outdoors for a week will usually shrug off a light frost.
in the full sunshine.
Water and feed regularly.
spent blooms to encourage new growth and blossoms.
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this plant for spider mite. Not much else bothers it.
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