Almost everybody here, currently it is standard practice not to amend trees. If you listen to experts on the radio like Don Shorr, Fred Hoffman, Former editor of Organic Gardening magazine Mike McGrath, Lee Reich PhD and author of about 7 books on gardening, pruning (great book!) and other gardening subjects all say not to amend. Fertilizer is the worst and can kill tree roots of new planted trees. Many other plants it is suggested, but a no no with trees at least according to current horticultural thought.
Exceptions to everything, and if you amend, you need to make sure you mix soil with native soil to stop the bath tub effect. Also It’s worried that roots will girdle, unwilling to leave the rich soil. We had a user here experience just that.
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