May Lotito wrote:... The ball of roots and dirt lifted up all seemed fairly shallow, less than 1.5 ft in thickness and without any sign of tap roots. Soil underneath is red subsoil. I have big trees around the house and am wondering how to get tree roots to grow down for better anchoring.
I suspect the roots are hanging out where the microbial action is, and red subsoil isn't very appetizing?
I know there are people who've tried "the hole" method, including myself.
I would choose a spot outside the drip line, but I was dealing with young small trees.
I'd dig a hole as narrow and deep as I can - I think the recommendation was 18" wide by 3 feet deep, but my land is glacial till (read rocks, rocks and boulders) so I do well to make it more like 3 feet in diameter and 18 inches to 2 feet deep.
Then I'd add anything compostable I had to the hole. I used to have a friend with organic horses, so their shit was welcomed, bedding from my ducks and chickens, veggie scraps from the prep table at a friend's restaurant, any plant matter I had a surplus of. I'd also toss in worms if there were any hanging around.
The goal is to give the tree roots something yummy to go looking for, and a way to get some water down deep where they'd also look for it. Give the tree roots a reason to go there.
In a perfect world, I would make several of these holes around the tree, but I do start by considering the likely damaging wind direction and going there first, as doing this on my land is incredibly difficult.