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I feel your pain. Literally. I live in Florida, and I've always called them "devil plants." The best way I've found to defeat them is to dig them up, put them in a plastic bag, and throw into the garbage. It takes awhile, but eventually you beat them back. Here's an article on some other methods: https://www.gardeningknowhow.com/special/organic/homemade-pet-friendly-weed-killer.htm

I would try to pour boiling water directly on the plant and root zones. This is a sure way to kill them and the seeds on contact. You will have to continue doing this as they emerge to kill them all off. This will ensure that you do not have to use chemical means.

Here is an article for more information on the plant: https://www.gardeningknowhow.com/plant-problems/weeds/controlling-sandbur-weeds.htm

I would try to pour boiling water directly on the plant and root zones. This is a sure way to kill them and the seeds on contact. You will have to continue doing this as they emerge to kill them all off. This will ensure that you do not have to use chemical means.

Here is an article for more information on the plant: https://www.gardeningknowhow.com/plant-problems/weeds/controlling-sandbur-weeds.htm

Typically these will not affect trees. They are for broadleaf plants, and will not harm a large tree. You can grow clover, as it will likely outcompete the sandburrs.

This article will give you information on controlling burrs: https://www.gardeningknowhow.com/plant-problems/weeds/controlling-sandbur-weeds.htm

This is Burr Medic.
This link will help you.
https://www.gardeningknowhow.com/plant-problems/weeds/burr-medic-weed.htm