I used to line the sunward side of flats with a strip of styrofoam sheet insulation to prevent too much heating on that side. However, you could produce a sand plunge without much effort by having a few yards of sand dumped in your work area, and just plunge the pots in it. Jane McGary, Portland, Oregon, USA On 4/28/2020 6:49 AM, Tim Eck via pbs wrote: > If you are concerned about radiant heating from the sun, you only need to > protect the side of the pots that receive low angle insolation. And if you > have a cluster of pots the outer ones will shade the interior ones. In my > overwintering sun-porches, I solve this with a strip of opaque plastic > affixed to the south walls from the shelf up to the height of the pots. In > the summertime I have no problem with morning sun because of trees or > mid-day sun because of elevation, but I need to protect the western to west > by northwestern exposures toward sunset. An empty row of pots works well > or any opaque plastic or barrier will do. Some nursery suppliers even sell > a "pot within a pot" system for trees. > A moist, loose soil with lots of air porosity is the worst actor because it > will act as a heat pipe, conducting the hot water vapor toward the interior > of the pots, killing far more roots in the process. > Tim in Pennsylvania > > On Mon, Apr 27, 2020 at 8:05 PM Jim Barton via pbs < > pbs@lists.pacificbulbsociety.net> wrote: > >> Does anyone grow California native bulbs in 1 gallon black pot in the >> Central Valley of California? The growing medium in my pots is becoming >> much hotter than the native soil where many of my bulbs are planted. Last >> weekend I made a shade structure of ½" gray PVC pipe and shade cloth, in an >> attempt to keep the pots cooler. The heat seem to be drying out the stems >> before they finisher blooming. Any other ideas? >> Jim Barton >> _______________________________________________ >> pbs mailing list >> pbs@lists.pacificbulbsociety.net >> http://lists.pacificbulbsociety.net/cgi-bin/… >> > _______________________________________________ > pbs mailing list > pbs@lists.pacificbulbsociety.net > http://lists.pacificbulbsociety.net/cgi-bin/… _______________________________________________ pbs mailing list pbs@lists.pacificbulbsociety.net http://lists.pacificbulbsociety.net/cgi-bin/…