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Killed a Sourwood
Hi, all. I planted a Sourwood in April, and it did well through June,
when it went into a rapid decline. It's still under warranty from the nursery, but before I get it replaced I want to make sure the same thing doesn't happen to the replacement. (And before you say "Google", it didn't help). Here's the detailed timeline: Early April: purchased 8' tree, set it into ground in what was to be a raised bed; but couldn't be completed because the tiller broke down. Mounded soil (mixture of native heavy clay, topsoil, peat, and manure) to height the bed would be and planted. Stupidly, planted tree in wrong spot and had to move it 2 feet over a couple of weeks later. Tree healthy, plenty of new growth. A Sweet Bay Magnolia was planted at the same time; it has remained completely healthy. Early May: Tornadoes hit; top 18" broken off of tree but no other damage. Blooms begin to form shortly after. Early June: Fill in rest of bed. Because the tree was planted in mounded soil, no additional dirt was placed over roots. Same soil mixture. Added an ounce of Azalea-Rhododendron fertilizer (because Sourwood is in the same family) and a small amount of aluminum sulfate; worked these in the soil with some manure. Mid-June: Tree in full bloom, but leaves starting to look transparent and taking on fall color. Coincides with summer heat arriving. Late June: Leaves dry up. They have not fallen yet, but are orange and bone-dry. Should I not have added fertilizer or aluminum sulfate, even in the conservative amounts that I did? Could my cats have overfertilized the tree? Could the tree have been stressed from the tornado, and not been able to handle the additional stress of summer heat? It's planted in full sun, in Zone 7, with good drainage. (I'm one county outside this tree's natural range). This tree was at the nursery a year ago, so this climate is not strange to it. |
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