Viewing post #1188409 by admmad

You are viewing a single post made by admmad in the thread called Is this a re-bloom scape?.
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Jun 20, 2016 12:14 PM CST
Name: Maurice
Grey Highlands, Ontario (Zone 5a)
The way daylilies bloom is tied completely to their growing points. A growing point is dead centre of the fan between the leaves that are produced on one side and the leaves that are produced on the other side.

The growing point produces those leaves.

When the fan is no longer juvenile, that is, it is mature or adult, it stops produces leaves and the growing point becomes the scape. When a fan produces a scape it is finished.

The easiest situation to think about is a crown with one single fan. When that crown blooms the fan has finished its job. The growing point of that fan is gone - it is all used up in producing the scape, its buds and branches, etc. The crown would be finished and die except that there are axillary growing points (axillary meristems) that can produce leaves. There is one axillary growing point or bud on either side of the scape. Each axillary bud is associated with a leaf of the old fan. After that single fan produces a scape one or two (or sometimes more) axillary buds start to grow. They will produce replacement fans. The growing points of the new replacement fans will only produce leaves until they are mature and then they will produce a scape and the process/cycle will start all over again.

Rebloom nearly always comes from a replacement fan. It is rare for a true single fan to produce two scapes. In short season growing areas (the north) it is sometimes possible to see what looks like two scapes on a single fan with some cultivars that have "left-over" scapes from a previous year and a scape for the current year.

@beckygardener it is rebloom. It also is the first and only scape from the second fan. Rebloom happens when a crown is growing well enough to produce new fans in succession in the same growing season that bloom in the same growing season in which they were first produced.

The normal cycle is small fan, fan grows larger becomes mature, fan produces a scape. New fan, fan grows larger becomes mature, fan produces a scape.

In short season locations, locations with cool summers, locations where the plant is not provided with good growing conditions, etc., the sequence ends more or less at fan produces a scape each year. In locations where the growing season is long, the plant is provided with optimum growing conditions, etc., the sequence can repeat one or more times - that is the crown/plant can rebloom one or more times each year.
Maurice

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