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Maple Forums on the UBC web-site

Variegated maple tree

UBC Maple Forum - Fri, 28/05/2021 - 21:55
Hi I live in Northern Ontario. I have a variegated maple tree which we have had for the last 3 years. It has been strong and healthy since we planted it. Believe it or not it is late spring in Thunder Bay and the leaves have just started to come out. They are not the usual bright green with yellow edges. They are very pale, sort of translucent and limp. I have no idea what is wrong with it. Can someone help, I really love this tree and don’t want it to die
Thanks for any help!

Recommendation Japanese Maple for full sun

UBC Maple Forum - Fri, 28/05/2021 - 07:04
I am looking for some recommendations for JM for full sun. It will be planted near to a summer gold. Ideally not too big perhaps up to 2m tall.
Would really appreciate some suggestions.

how fast will my container grown specimen grow

UBC Maple Forum - Thu, 27/05/2021 - 19:08
I thought I would just chime in with another note on container growing of japanese maples.
I was looking for some of our nursery photo's from the 90's and I came across this article (first photo). We did have a couple of garden magazines come to our property to do stories and photo shoots back in the day.

This particular photo is of our 16 year old "Seiryu" ( at the time) displaying its beautiful fall colors. Back then it was 16 years old and in a 2' x 2' cedar box , 20" high.


how fast will my container grown specimen grow

Is this Autumn Blaze Maple worth saving?

UBC Maple Forum - Thu, 27/05/2021 - 00:01
Hi guys, hope all of you are doing well in these crazy times. I know basically nothing about trees and would appreciate any thoughts on what is going on with the pictured Autumn Blaze Maple. I have done a lot of reading so far, and it looks like the tree was likely planted too deep, with the root flare was covered in mulch. So perhaps that explains most of the issue, but this tree has a sister roughly 30 yards away that was treated exactly the same way, and that tree is thriving. As you...

Is this Autumn Blaze Maple worth saving?

Maple Resources Discussion Thread

UBC Maple Forum - Wed, 26/05/2021 - 21:54
Hi all,

Some of you will remember that in the old forums, we had a section for links to maple-related web sites. I've moved some of these over as a "Resource" under these new forums.

General Maple online resources are available here:
Maple Web Resources | UBC Botanical Garden Forums

Written Maple resources are available here:...

Maple Resources Discussion Thread

Please help to save my acer

UBC Maple Forum - Wed, 26/05/2021 - 21:00
Could anyone help to save my acer. I bought an Acer Shaina at the end of March, the tree was healthy when I bought it but now is dying. Today I re-potted the tree to see if it could be saved but then I discovered that a section of the trunk near the root was turning black. Is it verticillium wilt? Any advice would be appreciated.

Unusual Korean maple seedling

UBC Maple Forum - Wed, 26/05/2021 - 12:44
Found this seedling among some Korean maple liners that I ordered this spring. Nice dark green leaves. Lighter colored seedlings are A. palmatum species

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Unknown cultivar

UBC Maple Forum - Wed, 26/05/2021 - 12:27
View attachment 211176 View attachment 211177

This is a tree I purchased during the winter, labelled as Elmwood. It didn’t take long once it started leafing out that it has Ben mislabelled. The question is... What is it? Does anyone else have one? It’s very different to anything else I have, but as each day passes or whenever I’m out looking at them, the more appeal is has. I posted some pictures yesterday by maf suggested creating a new thread regarding it. Here are some more photos...

Unknown cultivar

Advice would be appreciated please

UBC Maple Forum - Wed, 26/05/2021 - 12:02
These two trees were both purchased at the same time, same supplier etc. One is flourishing and the other is dying? Could it have been the frost? They were in similar locations during the frosts we had. I don’t know what to do? Is is salvageable?

Any help, from any member would bet met with huge lumps of gratitude.

Peve Starfish

UBC Maple Forum - Wed, 26/05/2021 - 00:04
I am pretty much up to maximum Acer content here but I keep finding the odd (and hopefully small) plant I can't resist. Created by Piet Vergeldt in the Netherlands

This one is a dwarf that looks like a starfish - the leaf curves down (web pic as mine has yet to leaf out)..

Palmatum Orange Lace

UBC Maple Forum - Mon, 24/05/2021 - 23:45
Spotted this in nursery on the’s a new one on me..I was strong and didn’t bring it home... I am unsure if it’s common elsewhere.


UBC Maple Forum - Mon, 24/05/2021 - 22:42
Hi there,

I live in Vancouver, British Columbia, Canada. I am interested in learning and doing my own grafting of my collection of Japanese Maples. Can anybody here recommend suppliers/growers/sources of getting A.P. rootstock?

Any info would be greatly appreciated!!!

Is maple harmful to my cedars?

UBC Maple Forum - Mon, 24/05/2021 - 22:32
I have a 12 foot cedar wall and today I noticed a large maple growing inside the hedge. My question is this maple harmful to my cedars and should I cut it down?



Darkest green leaves?

UBC Maple Forum - Mon, 24/05/2021 - 21:48
Which of your maples has the darkest green leaves?

Japanese maple leaf problem

UBC Maple Forum - Mon, 24/05/2021 - 11:47
Hi all,

I started collecting japense maple trees this year, so I bought about 15 of them in the same nursury, plan ot grow some mother trees in containers, and start sowing and grafting in the coming years. I planted all of them in 25 liter containers in a mix of potting soil, peat and pine bark.

Its been quite wet and cold for the time of year. In fact, the weather has been quite bad all spring, with the coldest april since I've been born.

I'm starting to notice problems one some of my...

Japanese maple leaf problem

Small black spots appearing on leaves

UBC Maple Forum - Mon, 24/05/2021 - 00:17

This morning I noticed on two of my small maples (Sango Kaku and Aka Kawa Hime) lots of small black spots have appeared on the leaves. I'm including a picture of each. This many must have appeared almost overnight because yesterday I didn't notice them. They're not on every leaf and seem to be mostly on the top most leaves of both trees, but there are some on the lower leaves as well. They can't be rubbed off and look like the leaf itself is damaged.

The other damage to the...

Small black spots appearing on leaves

My growing collection

UBC Maple Forum - Sun, 23/05/2021 - 21:40
Hi all, I’ve been lurking for the last few years, reading and learning and have finally joined. Firstly thank you for all the informative posts and beautiful pictures. I have only been collecting Acers for the last 18 months having just moved into a new house outside of London with my first garden. I have a small collection (circa 35 cultivars), mostly quite young trees. Thanks for letting me join your lovely community. Here’s a few pictures of some of my small collection. I’m sure I’ll take...

My growing collection

Viable seed

UBC Maple Forum - Sun, 23/05/2021 - 12:04
I’ve never kept seed separated by differ cultivars when collecting, but it’s clear some cultivars do not have viable seed.
Does anyone know which cultivars are viable and which are not, perhaps which have the best germination rate?

Sources of Rootstock in Canada

UBC Maple Forum - Sat, 22/05/2021 - 19:51
Just wondering if anyone can tell me where I might source some rootstock in Canada for Japanese maples? I intend to grow seedling in the future but for now I don't have any seedlings that are of the size usable.

Maple cultivar by another name OR (Synonym).#27 #458 #665

UBC Maple Forum - Fri, 21/05/2021 - 14:57
I wanted to see what the interest is on the Maples forum with regards to a thread that we can turn to, to see if a Maple cultivar we have seen and liked to add to our collection already exists but in a different name. Now I know the Maple Society has carried out some work on this and the updated Species list, but I felt as this forum is getting a very large amount of interest, then this thread might be of use.
It could also save you a lot of money !! Which is never a bad thing.
So I will...

Maple cultivar by another name OR (Synonym).#27 #458 #665


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