Japanese Maple (2) Part "boskop" "veridis" - Knowledgebase Question

Long Beach, CA
Question by tom_haggerty
October 3, 2001
Dear Sir,
I have landscape planted a grouping of a Boskop Glory and ("Veridis" ? lace leafed, dwarfed) with the hoped effect of the Boskop over shading the Veridis. Boskop approx. 2.5" caliper at 6.5', Veridis approx. 2.5" at 3.25' in landscape for 2 seasons.

(1st part)
The Boskop has robust lower branching that seems to be taking strength away from canopy growth, which is "weaker" by comparison. Q: Should I prune lower growth ( 2) (substantial branches) to aid better canopy growth? For the purpose of attaining the covering effect of the Veridis.

(2nd part) The Veridis gets full sun exposure for 2 thirds of the day. "Leaf burning/browning" begins to exhibit
itself in mid August. This season I applied a PROTEK silicon based product weekly to reduce "burning", with better results than the previous season, but the foiliage of the Veridis will not be in "shape" to offer fall color.
This coming season I had planned on utilizing shade cloth to protect the foiliage. Q: is the browning leaf burn? or another factor?

Both trees recieve light watering daily and a spring fertilizing (minimal) both trees exhibit "good culture" meaning, no rampant growth, so they appear to be fine in there chosen location, but not as robust as I would like.

I realize that you may need additional details, to offer a better opinion of these roughly outlined questions. Feel free to contact me at my email address.
FYI: I purchased the trees from a Burkard Nursery in Pasadena.


Image
Answer from NGA
October 3, 2001

0

one might be mislead to expect judging from other types of maples. In some ways this is a benefit because they are slow to outgrow their allotted location. On the other hand it means the results can be slow to appear in the landscape.

"Viridis" is often used as a catchall term, so which specific maple the smaller plant is, is anyone's guess beyond being a green-leafed dissected variety. If it was grafted, the nursery may be able to give you an idea of what to expect. If it is a seedling, there will be a certainamount of variation in the mature plants. Note that it is quite possible that this particular tree is more heat/moisture sensitive than the other. It is also possible that for some reason this tree has been slower to establish than the other, either due to competition or possibly to an overall relatively weaker constitution or even due to mishandling at some point in the growing/wholesale/retail/planting process having caused it to become rootbound or have some other root-based or graft-based problem. Sometimes, in other words,it is just beyond the gardener's control.

"Boskoop Glory" is the only named variety similar to "Boskop" I have been able to find described, and is said to be a red leafed form reaching approximately 15 feet in the landscape. Perhaps this is the one you have.

Keep in mind that a larger caliper tree will take several years (even three or four especially with naturally slower growing trees) to become established after planting, and will only reach its typical growth rate and vigor once it is established. Even so, I would not expect a Japanese maple with some age on it to grow faster than about six inches a year or so. A younger plant would of course grow faster.

In my experience, it would possibly be preferable to move the smaller tree to a different location and to use a shade tolerant shrub or possibly a piece of sculpture or one might be mislead to expect judging from other types of maples. In some ways this is a benefit because they are slow to outgrow their allotted location. On the other hand it means the results can be slow to appear in the landscape.

"Viridis" is often used as a catchall term, so which specific maple the smaller plant is, is anyone's guess beyond being a green-leafed dissected variety. If it was grafted, the nursery may be able to give you an idea of what to expect. If it is a seedling, there will be a certainamount of variation in the mature plants. Note that it is quite possible that this particular tree is more heat/moisture sensitive than the other. It is also possible that for some reason this tree has been slower to establish than the other, either due to competition or possibly to an overall relatively weaker constitution or even due to mishandling at some point in the growing/wholesale/retail/planting process having caused it to become rootbound or have some other root-based or graft-based problem. Sometimes, in other words,it is just beyond the gardener's control.

"Boskoop Glory" is the only named variety similar to "Boskop" I have been able to find described, and is said to be a red leafed form reaching approximately 15 feet in the landscape. Perhaps this is the one you have.

Keep in mind that a larger caliper tree will take several years (even three or four especially with naturally slower growing trees) to become established after planting, and will only reach its typical growth rate and vigor once it is established. Even so, I would not expect a Japanese maple with some age on it to grow faster than about six inches a year or so. A younger plant would of course grow faster.

In my experience, it would possibly be preferable to move the smaller tree to a different location and to use a shade tolerant shrub or possibly a piece of sculpture or other physical object to balance the larger tree in the composition. This way you will be able to grow both of the trees to their full potential.

I know that is probably not the answer you wanted to hear. You could also consult on site with a professionally trained, certified arborist to see if they have any suggestions as to what you might do to accomplish your original goal. Good luck with your trees.

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