Answer: As a cauliflower heads appear they need to be kept shaded--if the developing heads are exposed to sunlight they develop this purple tinge. This process of keeping the heads shaded is called "blanching". <br><br>Some cauliflowers are "self-blanching" in that they grow their own "shading" leaves, but even these sometimes need blanching if their protective leaves wilt. <br><br>There are a few things you can do. One is to draw up a few large leaves over the head and fasten them loosely together (you can use a clothespin). You can also break off one of the larger leaves from the bottom of the plant and lay it on top of the head in order to provide shade.<br><br>Often high humidity can cause this coloration as well, so be sure that air can circulate freely under the clipped- together leaves.<br><br>I have never seen anything to indicate that these discolored heads are a problem as far as eating. Certainly there are purple and yellow-green heads that are cultivated that way!
Q&A Library Searching Tips