Four Centuries of Obsession: The Strange and Beautiful World of Japanese Maples

There's a tree in my yard called Ukigumo — "Floating Cloud" in Japanese. Its leaves are pale green speckled with cream and pink, like someone flicked a paintbrush at it. Another one, Hot Blonde, emerges in spring the color of buttered popcorn before fading into a cool lime green. Then there's Mellow Yellow — which, as the name suggests, is aggressively yellow.

I've recently become a collector. At last count, there are 21 Japanese maples on this property. What started as one tree became three, then seven, and now I'm side-eyeing bare patches of lawn like a prospector scanning for gold. If you'd told me a year ago I'd be able to identify Acer palmatum cultivars by leaf shape alone, I would have laughed. Yet here we are.

The thing is, Japanese maples are genuinely fascinating once you start looking.

They've been messing with these trees for 400 years

Japanese gardeners have been selecting and propagating unusual maple variants since the early 1600s, during the Edo Period. A 1710 garden catalog from Japan listed 36 distinct cultivated varieties — and that was just what someone bothered to write down. When European explorers finally got a look in 1783, they lost their minds. The trees were introduced to the West in 1820, but it took another 80 years before they really caught on globally.

Today there are more than 1,000 named cultivars, with at least 350 in active use across Europe and North America. The term "Japanese maple" actually covers 23 different species of Acer native to Japan — though Acer palmatum is the one everyone pictures.

The name palmatum itself means "hand-shaped," referring to the five to nine-lobed leaves that look like an open palm. (The botanist who named it, Carl Peter Thunberg, was also apparently reminded of frogs' hands and babies' hands, which is both charming and slightly odd.)

How a tree becomes a cultivar

Japanese maples are unusually variable. Two seedlings from the same parent tree can look completely different — different leaf color, different shape, different growth habit. Walk through a maple nursery and you're looking at nature's A/B test.

Some of the most sought-after cultivars come from something called a witch's broom — a dense cluster of abnormal growth on a branch, caused by a genetic mutation. Growers take cuttings from these deformities, propagate them, and suddenly there's an entirely new dwarf variety with unique leaves and a compact form. The 'Coonara Pygmy' cultivar, for instance, originated from exactly this kind of mutation. A tree that only grows six feet tall, with spring leaves of bright green that shift to yellow in summer and deep pink-red in fall — all from one weird branch someone noticed and decided to propagate.

Other cultivars are created through grafting — taking a cutting from a desirable tree and attaching it to rootstock from a hardier species. This is how you get the vivid red dissectums and the ghostly white variegated varieties. It's part horticulture, part surgery, part obsession.

The seven groups

J.D. Vertrees, who basically wrote the bible on Japanese maples, classified all the cultivars into seven groups based on leaf division. There's the Dissectum Group — the weepers with leaves so finely cut they look like they've been through a paper shredder (in the best way). The Amoenum Group — wider lobes, only shallowly divided. The Dwarf Group — cultivars that stay under a certain height regardless of age. And several others that distinguish between how deeply the leaf lobes are split and whether the serrations are single or double.

To a casual observer: "it's a red maple." To a collector: "actually that's an Acer palmatum 'Crimson Queen' from the Dissectum Group, and you can tell by the doubly serrate sublobe margins."

We contain multitudes.

Why they're worth the fuss

Japanese maples aren't the easiest trees to grow. They want dappled shade — they're naturally understory plants in the forests of Japan and Korea. Too much afternoon sun and the leaves scorch. Too much wind and the delicate dissectums look like they've been through a hurricane. They want well-drained soil that stays consistently moist but never waterlogged. They are, in short, divas.

But when you get it right — when that spring flush of color emerges on a tree you planted with your own hands, in a spot you chose after hours of squinting at the sunlight patterns in your yard — there's nothing quite like it.

My collection is still young. Most of my trees went into the ground just this spring. Some are thriving. A few are looking a bit crispy where the afternoon sun is harsher than I expected. It's a learning process. You lose a few leaves, you move a sprinkler, you hang some shade cloth. The trees tell you what they need if you pay attention.

If you're thinking about planting your first Japanese maple: do it. Start with something forgiving — a 'Bloodgood' or an 'Emperor I' if you want red, a 'Sango Kaku' if you want coral bark that glows in winter. Plant it where it gets morning sun and afternoon shade. Water it deeply the first year. Then just... watch it do its thing.

And try not to end up with 21 of them.

No promises, though.