Why My Bean Plant Leaves Are Not Healthy. My Plant Is 2 Years Old.

Question

What fertilizer is best for beans plant? What is the water schedule for beans plants?

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Answer 1

This doesn't look good.I do think that I see a few different things going on here. There are signs of multiple issues, but it looks like I might see signs of spider mite infestation. That spotting may or may not be accompanied with webbing. You might be able to see small mites on the undersides of the leaves, as well. For this issue, I like to use neem oil. It is completely natural from the neem tree, and is quite effective.

https://www.gardeningknowhow.com/plant-problems/pests/pesticides/azadirachtin-vs-neem-oil.htm

The next thing to address is possible blight or wilt disease. Stress can invite fungi and bacteria into the soil, which can infect plants. Mites would definitely be a possible explanation for disease. You can try a fungicide to mitigate this, but many blights are not able to be cured. Trying plants in a different location would be the only thing that you can do in that situation.

https://www.gardeningknowhow.com/edible/vegetables/beans/bacterial-wilt-in-beans.htm

https://www.gardeningknowhow.com/garden-how-to/info/using-fungicides-in-garden.htm

As far as watering and fertilization goes- You really don't have to fertilize beans very often. Usually, they will form a natural relationship with bacteria that help them to produce their own nitrogen. Supplementing with a bloom booster or using a 10-10-10 compost once in spring will be all you need.

Watering is a bit more tricky, as far as timing, but straightforward. You don't need it unless the top two inches of soil are dry. When this is dry, water until it isn't anymore.

https://www.gardeningknowhow.com/ornamental/vines/hyacinth-bean/purple-hyacinth-bean-care.htm