Garfield County, Utah
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I have 15 Aspen trees in Cannonville, Ut., city next to Tropic. Two of them have remained very yellow all summer, and now the very tips are turning black on one. Our soil is not so good so I planted (4 yrs.ago) with lots of compost and renew every yr. with oak leaf mold. I also put in some fertilizer sticks next to each tree last year. The yellow ones I put extra composted horse manure on this year (not a lot) now the tips of the branches are turning black on one. Any input??
Garfield County Utah about 7 years ago