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- To: "s*@eskimo.com" <s*@eskimo.com>
- Subject: genetics question & greenhouse ventilation
- From: "* v* R* <l*@wxs.nl>
- Date: Sun, 28 Jun 1998 13:56:04 -0700
- Old-Date: Sun, 28 Jun 1998 22:56:21 +0200
In the part of my garden used for cut flowers, I am growing two varieties of Centaurea cyanus which I started from store-bought seed: "black boy" and the regular blue kind, about 1 1/2 meters away from each other. My question is: do these cross-pollinate, and what are the chances that seed collected from the black boy plants will produce dark purple flowers next year? (The package says nothing about hybrid, etc.). What about other Black Boy plants that are about 10 meters away in another area? Second, a bit off-subject--excuses for this, but don't know of a more appropriate list--I am looking for some advice about greenhouse ventilation. This spring, partly as an esthetic compromise, I became the owner of a Hall's (U.K.) hexagonal greenhouse with a pointed cone-shaped roof (2.5 meter diameter, walls 2 m high, to roof-point 3 m.). It came with a louver window at ground level, and the announcement that the cone roof provided excellent ventilation, although it doesn't open, and has only a very small opening. In anticipation of warm days (which hardly every come here in Holland, but you never know!), I ordered a second louver window which arrived yesterday. Now the question: According to the man who delivered the window, both windows should be high (the pane that goes from 120 cm to 180 cm above the ground) to let the hot rising air out. On the paper from Halls, stands the instruction (with no explanation as to why) to install the window in the bottom pane fom 0 - 60 cm above the ground (assuming one window). My idea was to place one low, and the other high and on the other side, in the hope that cold air would be sucked in under and rise and go out above, creating mre circulation. The man from the garden center sticks by his advice of two high. Which choice do you think will give the beter ventilation? I do realise that on 'normal' rectangular greenhouses, the windows are high--but also placed in the slanting roof, which I cannot open. Any advice is appreciated! Lynn van Rooijen Netherlands
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