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Maple Forums on the UBC web-site

Acer ’Shaina’ stem cross-section black streaks

UBC Maple Forum - Wed, 20/02/2019 - 00:30
I have a problem with one of my Acers (a Shaina) and wanted to see if anyone could help identify what has gone wrong.

It is fairly young, it was in the ground after I planted it last October after leaf drop and it looked very healthy. I took my eye off it a bit but watered it, it was in a sheltered, shady spot that isn’t very dry, around other trees - but last week I noticed dead portions on the branches and dead/burnt out buds on those branches. I cut back those branches but see here,...

Acer ’Shaina’ stem cross-section black streaks

Acer palmatum Jjoshi (or Ijoshi)

UBC Maple Forum - Mon, 18/02/2019 - 17:35
Just bought this but the label could be read as either spelling. Any info other than the picture on the front of the label which depicts it as pink (early growth) and green edged pink later



Maple Society OSI: Peter Gregory's Acer distylum Profile: en français!

UBC Maple Forum - Sun, 17/02/2019 - 20:09
C'est avec grand plaisir que la Maple Society vous propose une nouvelle traduction en français des fiches descriptives de Peter Gregory sur les érables.

The Maple Society OSI is very proud to present the first in a series of French translations of Peter Gregory's Maple Profiles.

Voir la fiche de l'Acer distylum, distylumGregoryFrancais.pdf : Open Science at the Maple Society | The Maple Society

Special thanks to our own...

Maple Society OSI: Peter Gregory's Acer distylum Profile: en français!

Maple Society 2019 Conservation Award

UBC Maple Forum - Mon, 11/02/2019 - 18:36
This is a call for applicants for the conservation award, I've pasted the text from our own Hugh Angus below. A personal reminder that individuals interested in conservation are encouraged to apply in support of their projects. -E

The Maple Society will again be offering a £1000 bursary to support a maple conservation project. This will be the sixth year we have run this award scheme.

We would like to invite both institutions or individuals to apply for the above bursary under the...

Maple Society 2019 Conservation Award

For Maple Society Members

UBC Maple Forum - Thu, 31/01/2019 - 18:37
If you are a member in good standing with The Maple Society, you can sign up for "The Maple Society" usergroup. This gives you access to a private forum where participation is reserved for Maple Society members.

How to Join the Maple Society: Fill out one of the forms on the Maple Society website

How to Sign Up for the Maple Society forums usergroup:...

For Maple Society Members

Acer sieboldanium

UBC Maple Forum - Sun, 27/01/2019 - 12:31
Any thoughts on what this acer sieboldianum might be? The place I bought it from thinks it was called atarvii but wasnt particularly confident and the only stuff online involves that particular nursery.

It's a very nice color, looks almost like a large version of autumn moon.

Growers experiences with dyna gro protekt

UBC Maple Forum - Sun, 27/01/2019 - 01:32
I am looking for information regarding the plant supplement dyna gro protekt. The product is a 0-0-3 formulation. Dyna gro promotes it as having a higher level of potassium and silicon to help plants build stronger cell walls which provide a "pro-tekt-tive" barrier against piercing/sucking insects and invading fungai.
First hand experiences regarding the use and benefits(if any)by growers of maples will be appreciated.
Thank you in advance,...

Growers experiences with dyna gro protekt

Safe horticultural oils for maples

UBC Maple Forum - Tue, 22/01/2019 - 18:27
I see notes for dormant oil generally "do not use on sensitive plants" and maple is listed as one of the sensitive plants.

I have maple leaf galls on my maples and a similar gall on my lindens. Treatment says, "spray with dormant oil"

I've read eslewhere of people using dormant oils on maples, but can't find it now. What brands/types of horticultural oil are useful agains leaf galls and are safe for maple trees?

Lost nursery name

UBC Maple Forum - Mon, 21/01/2019 - 05:21
I am searching for the name of a Jpm nursey in New York state, not in the city. It was highly recommended, run by a woman, and seemed to sell young trees, if my memory serves.
I'd like to try a young ap. Murasaki kiyohime this year, so I can guide its branch structure wide.

Lost a beauty last year to late frost after warm weeks, in Massachusetts.

Garden season is fast approaching!

Root stock vs. Scion

UBC Maple Forum - Mon, 14/01/2019 - 02:03
Hi, I have a general question related to the root stock and scion of a Japanese Maple.
Is the growth of the JM depends mainly on the root stock or from the scion?. For ex: I bought two Acer Palmatum 'Bihou' about the same time, both are 2nd yr grafted from the two different places in Oregon about 3-4 yrs ago. One of them now is about 5-6ft tall while the other slowly grows about 2 ft tall.
So I was wondered is the strong root stock will help the tree grow faster or it is depended on scion?...

Root stock vs. Scion

Japanese Dwarf Maple for southern CA zone 9

UBC Maple Forum - Wed, 09/01/2019 - 18:58
Dear all,

This is my first post to this forum. I wanted to ask for your advice on a type of Japanese Maple with coral bark to be grown in the soil in my area in Thousand Oaks, Ventura County, Zone 9b. The area will receive full sun in the morning and afternoon shade. It needs to be 5 to 10 feet mature height.

I think I've narrowed it down to Beni Kawa, Fjellheim, or Aka Kawa Hime. My primary concern is which of these varieties have the highest heat tolerance. This past summer was unusually...

Japanese Dwarf Maple for southern CA zone 9

Maple Society OSI: Peter Gregory's Acer erianthum Profile

UBC Maple Forum - Mon, 07/01/2019 - 11:16
Happy New Year from The Maple Society! This month the Open Science Initiative (OSI) is publishing Peter Gregory's Acer erianthum profile, with photographs by Hugh Angus. The Woolly- or Downy-Flowered Maple is rare in gardens and deserves more attention for its pretty upright flower spikes and wide architectural leaves. Check it out at

Open Science at the Maple Society | The Maple Society

This is the next in an exciting OSI series...

Maple Society OSI: Peter Gregory's Acer erianthum Profile

Does this mean death?

UBC Maple Forum - Sun, 06/01/2019 - 21:32
Lately it has gotten pretty cold out. It snowed last night but I have my potted maples in an unheated shed and noticed some black on the trunk. Is this ok when dormant or is this a sure sign of death? Since most of my trees have color differences I didn’t know if this varies from different cultivars ..They still have buds on them.

View attachment 162552 View attachment 162551 View attachment 162550

Is my maple sick?

UBC Maple Forum - Sun, 06/01/2019 - 21:23
Can anyone point me in the right direction of what to do with my tree. It seems to be turning black and dying from the top down.

Maple Society registering cultivars?

UBC Maple Forum - Thu, 03/01/2019 - 18:20
Can anyone tell me if the society is publishing cultivar registrations in Acer (as the ISHS mentions) and where to find them? I'm not a member but one member told me he had not seen any.

The Open Registration Of Cultivars (OROC) project recently published 87 new Acer cultivars with sources. We don't want to duplicate the efforts of others if the work is complete enough and 100% free to the public.

Larry Hatch

For the love of maples; Growing a Greener World

UBC Maple Forum - Tue, 01/01/2019 - 16:17
This episode of Growing a Greener World, For the love of maples; focuses on Japanese Maples and tells the story of Mr Maple dot com. Here is a link to the episode on YouTube:

Podcast- Japanese maples a passion and profession with Matt and Tim Nichols:
Japanese Maple Nursery | Growing Japanese Maples | joe gardener®

For more information and...

For the love of maples; Growing a Greener World

Acer palmatum shiraname

UBC Maple Forum - Fri, 28/12/2018 - 16:32
good afternoon I write to you from Gijón ASTURIAS Spain and I was interested in information about the Acer palmatum shiraname I would like to know if it is worth planting it in the garden in full sun since in the garden I have nothing of shade. My doubt is in planting acer palmatum shiraname or HOGYOKU I have not seen any of them and in Spain they do not find what I would have to ask for online they would do me a great favor for the information. Thank you

Potted JM too big?

UBC Maple Forum - Wed, 26/12/2018 - 10:01
My local nursery and (family friend) has obtained a thick 6 foot, 25 gallon Oshio-Beni from another nursery that went out of business. The original price is $700 but she said she would give it to me for $300

My question is what is too big for a pot? I’ve read that some get too big, but I’ve also heard you can grow any JM in a pot. Are there any disadvantages to this if the soil mixture and everything else check out? I have a very large custom made box on wheels that I wish to put this in....

Potted JM too big?

Preferred fungicide

UBC Maple Forum - Thu, 20/12/2018 - 23:32
Hi all.

Whenever you cold stratify seeds, what is your preferred fugicide to mix in? Is hydrogen peroxide a viable option? I have some stronger stuff, but would rather not mess with it unless truly necessary.


ryu sei (purchased October 1)

UBC Maple Forum - Mon, 17/12/2018 - 19:19
I was at a nursery in Toronto and they were offering a discount of 30% on most of their nursery stock.

I picked up a potted "Ryu Sei". (I had a place for a JM as long as it would remain compact).

This specimen is probably about 4.5 feet in height.

I would think this is the definition of root bound?

And here it is now in the ground.

I am curious if others have this variety and the height of your specimen.

Would it benefit from protection this winter (I am a zone 5b Cdn)?


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