Question
I grow in a green house in containers. My zucchini plants are real big and look very happy and healthy. The zucchini seems to grow to about four inch's long and then turns yellow and then brown at the tips. What am I doing wrong.

Answer
Keith:

I suspect that your zucchini are suffering from like of nutrients. Try using a good grade of organic fertilizer and water it in good. Zucchini usually need a lot of room to expand you might try using strings and letting them grow on the strings stung across and near the plants.

I do not believe that there are insects or a fungus or virus attacking the plants Good pollination in a green house is necessary.

Best wishes.

Don