[mkl]

The article says they're only 1-3 metres tall.

[culi]

Avocado trees on plantations are usually specifically pruned not to grow past 2-3 meters to make them easy to pick. In the wild they can grow 5x this size, but the article is specifically talking about a plantation

[mkl]

If you look at the pictures of the site [1] you'll see there's essentially no shade from these stones for trees, even 2-3 metre ones.

[1] https://tp.revistas.csic.es/index.php/tp/article/view/881/95...

[pdw]

And also that many of the stones are buried deep in the earth.

[Mordisquitos]

Even better then, we can bury the avocado trees next to them to get even better shade. Problem solved.

It's amazing how us HN geeks are so good at coming up with original and effective solutions in non-IT fields.