Plants have to reach a certain stage in their
development before they are able to have flowers and
set seed. Before this happens, the plant is said to
have juvenile tissue. Once it starts to flower, it
has transformed into mature tissue.
This is not always a straight forward process. Some
trees may take 15 or 20 years to become mature while
others such as oaks and
beech have both juvenile and
mature branches on very old trees.
Level - All plants have a certain level of light
that is needed to trigger flower production. This
level will vary between full sun and shade type
plants but they all have their requirement. If it is
not met for a particular plant in a particular site,
it will not flower.
Inadequate Chilling -
Ever wonder why you don't see apple trees in
Southern Florida? One big reason is that the flower
buds of apple trees need to be exposed to cold
temperatures for a certain number of weeks or they
will not bloom.
Winter Kill - Many of
the shrubs and trees that bloom in early spring to
early summer develop their flower buds the previous
autumn. Flower buds are the most tender tissue on
the plant. So, if the winter temperatures drop
unusually low, especially with strong winds, the
buds may be killed.
Buds Are Removed -
Again, some plants put on their flower buds in the
fall. So, pruning them in the fall or winter simply
removes flower buds. These types of spring flowering
plants should be pruned after they get done
Transplant Shock -
Some plants just take a season or two after being
transplanted to begin to flower.
Iris are noted for
not always flowering the first year after being
divided and moved.
Nitrogen - Over
applications of nitrogen
fertilizers may lead to an
excessive growth of foliage at the expense of
Pest Problems -
thrips, botrytis blight and others
may damage the buds and cause them to abort.
Drought - Flowers are
a fleshy, lush type of plant tissue. Severe drought
can dry out the buds or the flowers on plants. Keep
flowering plants watered properly.
Wrong Plant, Wrong
Place - Plants that are not properly adapted to your
climate zone may have problems flowering (or