Japanese Maple Sun Requirements

[The Warm Canuck]

Is direct sun from sunrise to 11-noonish, sufficient for ideal JM growth. (I understand cultivars very on their requirements.)

 

[19Mateo83]

Should be ok, I have some in full sun with no issues, others need almost full shade. What cultivar(s) do you have?

 

[GGB]

Sounds like an OK minimum, but the duration of sun will be changing all season long. And it might not be linear, depending on over head obstacles, amount of daylight and the suns position in the sky

 

[Gabler]

That sounds ideal. That's gotta be more than six hours of direct sunlight per day up in Canada. What time is your sunrise this time of year?

Edit: I was able to look it up. It looks like most parts of Ontario see the sun shortly after 6:00 a.m. this time of year. Five to six hours of direct sunlight in the cooler half of the day is pretty good.

 

[NateDyk47]

It really depends. You're in a colder climate, so I wouldn't expect leaf burn to be a problem for most JMs that are otherwise healthy.

If not causing sunburn, all day sun will give you smaller leaves, shorter internodes, and faster overall growth. I try to give mine as much sun as they can handle, unless it's a specific cultivar I'm trying to persuade certain colors out of (e.g. white variegated leaves).

 

[The Warm Canuck]

Should be ok, I have some in full sun with no issues, others need almost full shade. What cultivar(s) do you have?

Regular Palamatum
Higasayama
Seiryu
Sango Kaku
Shindeshojo
Bloodgood

and some Acer Shirasawanaum

 

[Dav4]

Ideally, full sun through the morning and dappled shade in the afternoon when it's hottest. Fwiw, I've found most palmatums can take more sun than that, but windy, hot days with relatively low humidity can be problematic and dramatically increase water needs, even with those in more shade.

 

[19Mateo83]

Regular Palamatum
Higasayama
Seiryu
Sango Kaku
Shindeshojo
Bloodgood

and some Acer Shirasawanaum

You are good to go with those.