I saw this maple in a park in November 2024, in the shade of big conifers. The photos don't render the beautiful red colours it displayed : I collected seeds that I stratified in the fridge, but none of them have germinated - so far. Went back today. I missed the Spring flush, but that's what it looks like today : The leaves are 5-, or mostly 7-lobed, and are a dark, almost bronze-like green. The flowers go upright, like shirasawanum. I won't discard the seeds, I'll sow them in a tray outside. If it's hybridized, or related to shirasawanum or japonicum, they might take 2 years to germinate. Any suggestion of what it can be ?... Here nearly 30° today, and they forecast rainy storms for tomorrow night, and... 13-15° next week !
The seeds will probably hang down in the normal fashion when they get a bit heavier. Acer shirasawanum or japonicum crosses usually have more leaf lobes than seen here. There are a few different "variants" of Osakazuki out in the wild west of nurseries and arboretums. This might be one of them or even a child of one of them. The fall colour certainly fits. (P.S. I think @emery posted recently that amoenum seeds such as Osakazuki and similar usually take 2 years to germinate.)
Thanks maf, likely O-sakazuki, yes. Her's another one : it's from the seed exchange a couple of years ago (before Brexit), and of course I lost the tag. ^^ It might have a bit of chlorosis, I must slip-pot it in a more acidic soil. But I like it... ;°)
What kind of iron or nutrient do you recommend should be added to help eliminate chlorosis, would several doses of seaweed be sufficient..I understand it takes an entire season to see good results. chlorosis Is present on some of my 3 year old green seedlings, I gave them a light dose of seaweed last year and repotted, I remember @maf suggesting (I think) watering with only rainwater can cause nutrients to drop out in small seedling pots
I use a fertilizer with chelated iron in it. Most of the products you can buy also have other components like magnesium, etc.
Yes, where we live (but not everywhere) the tapwater essentially has a weak supply of most macro- and micro-nutrients included, straight out of the tap. Rainwater on the other hand is very pure and can leach nutrients from pots. If you are 100% sure it is an iron deficiency causing the chlorosis you can buy some chelated iron from the garden centre and add that. However, not all examples of chlorosis are caused by iron deficiency, other micro nutrients could be the cause, so it is better to add a balanced micronutrient package. And if the micronutrients are leaching out of the potting medium then the macronutrients are likely doing the same, so why not use a balanced fert with everything? This is a good all-in-one fertiliser that I have used on various things, it has a very good micronutrient package including iron that is chelated by DTPA rather than the cheaper and less effective EDTA: https://solufeed.com/products/easy-feed-extra. It is liquid so easy to deal with, keeps well after opening in a dark and cool room, and even includes calcium which most fertilisers do not. Only available mail order which explains why it is £14 for one litre and £20 for 5 litres. Obviously I buy the 5 litre pack and decant 500ml or a litre into a smaller bottle for ease of use!
