Soil and Compost forum→Coarse volcanic soil

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Razrburn
Mar 23, 2021 11:33 AM CST
So I recently purchased a tiller and wanted to start a garden just outside of san Antonio, tx. The land has a ton of rocks. After a bit of tillering and rock raking I've come to the conclusion that the property is covered in mostly black volcanic rocks, like 5-10% organic matter, and the rest volcanic rocks ranging from potato sized down to the size of nerds candy. There are different types of volcanic rocks in the mix it's just mostly the black type crushed into small rocks

Im in the process of sifting out rocks for landscaping/creating a area ideal to garden. I'm considering options on what I should do, I was planning to grow a variety of garden plants. my research is telling me some plants will do great in the soil as it is and others will struggle. I'm thinking about mixing top soil with a section of the garden to appeal to different plants. Im hoping to get a ratio of what I should mix and how deep should the new topsoil mix extend

I picked up some seed for corn, tomatoes, carrots, onion, green pepper. Probably a few others that slipped my mind. I'm hearing watermelon doesn't like the soil and I was a little bit disappointed in that specifically. I'm sure a few others in that list of seeds won't like the soil as well any suggestions?
Name: Lauri
N Central Wash. - the dry side (Zone 5b)
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lauribob
Mar 25, 2021 10:51 AM CST
Have you thought about building some raised beds with imported soil and compost for plants that won't thrive in your native soil?
More costumes, less uniforms!
Minnesota (Zone 3b)
RpR
Apr 22, 2021 1:10 PM CST
For a bed that has enough depth for good corn you should go down twelve inches, mix the two soils well by roto-tilling heavily the first time.
After that it is just wait and see how it turns out.
Better to do it and not need it, than need it and not do it. I tip my hat to you.

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