The short answer is none. The long answer is none whatsoever!
There are two routes for you to go down to get a guarantee that is worth something.
There are two routes for you to go down to get a guarantee that is worth something.
Firstly you only ever purchase a maple from a reputable nursery or even better a maple grower. The grower is better as they actually propagate their own stock so have mature stock plants and know what variety they are.
Good nurseries buy from growers with their plants labelled by the grower so there is less chance of the trees being misnamed. Neither method is foolproof though which is why you are best becoming your own guarantee.
If you buy the books, use the Internet as an information resource, which is essentially what it is you can very quickly build up a mental knowledge of the characteristics of the individual cultivars. All you need then do is get yourself along to the nearest arboretum or maple collection and test your knowledge on real live plants.
Within very short order you will have more than a basic knowledge of the differences in the cultivars. Ideally you should go back in the depths of winter and view the trees "naked". Not you of course as it's far too cold to expose your flesh to the elements but the trees will be naked in that they have no leaves.
Many cultivars have different growth patterns and these become clear when there are only branches and twigs to contemplate. Of lesser use in guaranteeing the cultivar but a useful skill to develop nonetheless is to study the bark. Often times it is enough to see the striations or patterning on the bark or even the colouration of this years twigs to point you in the right direction in assessing which cultivar is which.
Unlike Snakebark Maples where the bark is the deciding factor in cultivar/species naming in Japanese Maples the bark is just a guide but all things considered it's a fairly accurate one when used in conjunction with growth habit and twig colour.
So my advice is to become your own guarantee and push your knowledge of these marvellous trees onto the next level. It will pay dividends time after time especially when you come across a real naked gem in some winter time plant clearance sale where the garden centre or nursery owner has "lost the label"!
Good nurseries buy from growers with their plants labelled by the grower so there is less chance of the trees being misnamed. Neither method is foolproof though which is why you are best becoming your own guarantee.
If you buy the books, use the Internet as an information resource, which is essentially what it is you can very quickly build up a mental knowledge of the characteristics of the individual cultivars. All you need then do is get yourself along to the nearest arboretum or maple collection and test your knowledge on real live plants.
Within very short order you will have more than a basic knowledge of the differences in the cultivars. Ideally you should go back in the depths of winter and view the trees "naked". Not you of course as it's far too cold to expose your flesh to the elements but the trees will be naked in that they have no leaves.
Many cultivars have different growth patterns and these become clear when there are only branches and twigs to contemplate. Of lesser use in guaranteeing the cultivar but a useful skill to develop nonetheless is to study the bark. Often times it is enough to see the striations or patterning on the bark or even the colouration of this years twigs to point you in the right direction in assessing which cultivar is which.
Unlike Snakebark Maples where the bark is the deciding factor in cultivar/species naming in Japanese Maples the bark is just a guide but all things considered it's a fairly accurate one when used in conjunction with growth habit and twig colour.
So my advice is to become your own guarantee and push your knowledge of these marvellous trees onto the next level. It will pay dividends time after time especially when you come across a real naked gem in some winter time plant clearance sale where the garden centre or nursery owner has "lost the label"!
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