Latitude and its effect on bloom times

Mary Sue Ittner
Fri, 29 Jul 2011 18:24:31 PDT
I think sunshine and the amount of light are big factors in when 
things bloom. Like Jane I still have Brodiaea in bloom (elegans, 
californica, purdyi) and Bloomeria too, at least a few flowers left. 
We had a lot of rain where I live this year and late rain as well. So 
there was not as much light and warmth and therefore everything was 
late in starting. We haven't had much really hot weather either so 
that means that once the native bulbs started blooming they lasted 
longer. So I think it was more than just the soil being moist which 
you could achieve by watering. But if it helps, I live at about 840 
feet (256 meters) with a distant view of the Pacific Ocean. Being 
coastal is a major factor in my climate.

And  the Gladiolus tristis in bloom is one that always blooms in 
summer. I grow other Gladiolus tristis that bloom in spring and also 
are long gone.

I have a lot of Amaryllis belladonna that never flowers even though I 
live in an area where you see a lot of it blooming every year. I have 
a lot of trees in my garden and I don't think many of the plants get 
enough light and they also may not get enough summer water. I know 
that may sound strange, but when we've discussed this before people 
have said that they bloom better with some summer water. We do water 
a bit, but the tree roots are very greedy when it comes to summer 
water and the soil remains dry. Where you see them naturalizing and 
blooming reliably, it is usually very open. Bill Welch may want to 
speak up on this subject, but I seem to recall him saying that 
hybrids especially needed some summer water to do well.

Mary Sue

>  Flowers that Mary Sue and Jane report in bloom now (Bloomeria 
> crocea, Gladiolus tristis) are long since dormant here, with the last of
>their seed pods drying out and cracking open.
>Mary Sue's about 200 miles north of me, and Jane is 500 miles.

More information about the pbs mailing list