I transplanted a number of cucumbers and crookneck squash/zucchini plants in a 4'x 8'x 15" raised bed about three weeks ago. One of the crookneck squash plants on the west side of the bed has been slowly turning yellow over the last week or so and I've also noticed that three of the twelve cucumber plants are a bit slower in their growth than the others, though still fairly green. These cucumbers happen to be the ones nearest the crookneck. I had thought the yellowing crookneck was the result of overwatering, but now that there seems to be something going on with the nearby cucumbers, perhaps there's an issue with the soil in that area of the bed. I've got a zucchini that's only about 12 inches east of the yellowing crookneck that is doing really great, so I'm scratching my head on this one. Any thoughts you might have would be really appreciated.
Uneven Growth in Raised Planter Bed
Certified GKH Gardening Expert
Are they wilting too? If so, this could be the onset of bacterail wilt, which is detrimental to both squash and cucumbers. This article provides common reasons for yellowing of squash plants: https://www.gardeningknowhow.com/edible/vegetables/squash/why-squash-leaves-turn-yellow.htm Mosaic is another possibility that could affect these plants: https://www.gardeningknowhow.com/edible/vegetables/cucumber/cucumber-mosaic-virus.htm