Where are you located? What is your climate?
I'm a docent at a public garden that has four different Japanese maples:
Bloodgood, coral bark, green laceleaf, and red laceleaf. Because of a
lack of humidity in the summer (generally below 50% in July and August,
often below 35%, occasionally below 15%), they are severely stressed.
They do get sufficient soil moisture, but the leaves still show
significant burning on the tips by August. Some show tip burn already
this year, in April.
Perhaps your climate is not suitable for Japanese maples.
David E. Ross
Climate: California Mediterranean
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