Does the lace leaf maple (yaki yame) leafs usually turn brown during extremely hot weather? planted 1 month.?
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Cut leafed Japanese Maples are delicate plants that can burn in the heat & wind of summer, especially when newly transplanted. You need to walk a fine line of providing sufficeinet water & over watering during these hot periods of summer. The best technique is to monitor the soil moisture daily. Use your finger to test the top 2-3" for soil moisture. When the top 2-3" is dry under your tree, but you still have moist soil below that point, then water your tree. Deep infrequent watering is always the best for a tree.
Now, your maple may still be alive. Look to see if you have viable new buds (they look plump and moist) on the branch tips. Use your fingernail to scratch a little bark off of a couple of the smaller branches to see if its still green below the bark. If this is true, then continue to water the tree as described above for the rest of the growing season. There is a chance that your maple will bud out next spring.
A new tree needs to be kept moist, but not waterlogged for pretty much the whole first year after it's planted. It is very common for a tree to go through transplant shock and lose it's leaves after it is planted, especially in the hot summer. If you give it adequate moisture, it should shoot out new leaves in a few weeks.
I worked on a project for a park, and the landscape contractor planted a bunch of 2 1/2" caliper London Planetrees. They were planted in mid-June and about a month after they went in the ground, all of the leaves dried up and fell off the trees. A few weeks to a month later, they shot out new buds and are doing great now.
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