My extension recommended to grow won bok during cooler weather. He said mid 80's and above is too hot, and will cause it to bolt.

Wong bok is in the cabbage family. Just as with American cabbage or other cabbages common in your area, it won't like heat. Grow as you would other cabbages in your area.

Check with your state's Extension Service. Each county should have it's own Cooperative Extension Office which provides free publications and information for the asking. They can also tell you the average last frost date for your area and ideal planting times for specific crops and varieties in your area.

The following two images are excerpts from the Vegetable Planting and Planning Calendar for Missouri (download the pdf complete with spring and fall planting dates, how much to plant per person, etc. Just call up the office in your county. Look under the "Government" section (usually blue pages) of your phone book under "Extension". They will have valuable vegetable/gardening tables available specifically for your area from data they've collected from growing those crops in your state.

Violet

{{gwi:385463}}

{{gwi:385464}}