Yellow Zucchini Leaves

Question

I am growing a zucchini in a multiple Topsy Turvy planter and the leaves are turning yellow. Is it because there are too many plants? Also, a roma tomato and a burpless cucumber that seems to be doing alright. What would you suggest? The area is on a patio.

Answer 1

Here is an article that you may find helpful: https://www.gardeningknowhow.com/edible/vegetables/squash/why-squash-leaves-turn-yellow.htm