What's your question? Ask

Hyacinth Plant

Q.Vegetables in new earth boxes

Zone Robstown, Texas | DMS added on December 4, 2016 | Answered

After I set my boxes up, I bought from a local nursery: tomatoes, cucumbers, yellow squash, and bell peppers. Within two weeks the plants were HUGE! Thank goodness I had also built a sturdy 7-foot trellis on planting day. It looked like it was going to be a bumper crop. The squash and cucumber had so many blooms. Soon I noticed the green leaves became less green and their veining showed through. A friend said powdery mildew. I used the organic spray for that but then all the little fruits began to turn black. The plant never stopped blooming but the babies never developed. The base of the plant turned black also. I got ONE beautiful squash before I gave up and pulled them up. The cucumber gave either small or misshapen fruit. So my question is: is the growing medium contaminated? I’m not ready to give up on the boxes, but I hate to go to the expense of buying more potting mix if I don’t have to. I’m very new to gardening. I live in the lower coastal bend of Texas. Thanks.

A.Answers to this queston: Add Answer
Certified GKH Gardening Expert
Answered on December 4, 2016

This could be a nutrient deficiency or a pH problem in the soil. When leaves turn pale green or yellow, but the veins stay green as in the following images, it is often a sign of iron deficiency or too-high soil pH:


When fruits turn black starting from the end, it can be because of a nutrient imbalance or pH problem:


A soil pH test and/or soil nutrient test could help clarify what the problem is. Or, if the boxes are quite small, the plants may simply not have enough soil to draw nutrients from.

A powdery mildew infection looks like white powder has been dusted over the leaves:

Was this answer useful?

Log in or sign up to help answer this question.

Did you find this helpful? Share it with your friends!

You must be logged into your account to answer a question.

If you don't have an account sign up for an account now.

Looking for more?
here are more questions about...
Hyacinth Plant
Join Us - Sign up to get all the latest gardening tips!

Do you know a lot about gardening?
Become a GKH Gardening Expert