Re: Re: HYB: Stratification
- Subject: Re: [iris-talk] Re: HYB: Stratification
- From: B* S*
- Date: Mon, 08 Oct 2001 10:06:18 -0400
On 10/8/01 9:35 AM, "alhbee@aol.com" <alhbee@aol.com> wrote:
> We had a hard frost this morning 29.3. Ice in the bird bath. Fleshy
> flowers like wax begonias will go. We live in, geologically, the
> Culpepper Basin and we have been 15 degrees colder than locations 30
> miles north of us. Still have a couple things to get in the ground. I
> agree with Linda, by the week we will be the 70's. Twenty below is
> coldest I've seen.
>
> Al Bullock
> Z7 No. Va.
Light frosts here and there in the Farmville area this morning. However, at
our house, the low was 37F, and there was no damage to tender plants left
out, while a friend in a local "cold spot" reported 28F. We live on a low
ridge, and cold air tends to drain away; the exception is the outside of the
north wall of the greenhouse, where cold air moving downslope gets trapped.
Tree cover helps to trap heat rather than letting it radiate away. Frosts
can occur even though the air temperature does not reach freezing, if the
night is clear and quiet. Radiative cooling from surfaces is the culprit.
Bill S.
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