Tuesday, June 26, 2012

Blotch Heat Stability

As mentioned in a previous post (The Hulthemia Holy Grail - Blotch Heat Stability), the heat stability of the Hulthemia blotch is one of the biggest challenges in breeding for this group of rose hybrids.  The Hulthemia shown below was a brand new seedling in 2011 and got my attention when it first bloomed.  I made a post (A Most Remarkable Blotch) about this seedling last year.  This year it appears to have excellent blotch heat stability given the fact that last week on the 2 days prior to this bloom opening, the temperature was 102º F and 108º F, and then 102º F again on the day this photo was taken.  Like many of the other Hulthemias with improved blotches, this one doesn't seem to release any pollen.


  1. Good thing it seems to be seed fertile, Jim.

  2. Hi Simon,

    That is what I am trying to find out. Actually the hip in the photo is on an adjacent seedling that is growing intertwined with this one. I am applying mixed "Knock Out" series pollen on this one.