🌸 Kwanzan Japanese Flowering Cherry

What it looks like

Why this variety

Kwanzan — spelled Kanzan in botanical lists, Kwanzan in American nurseries; same tree, two spellings, one very pink spring — is the Japanese flowering cherry most people picture when they hear ‘cherry blossom.’ Its flowers are double, deep pink, and borne in dense, pendulous clusters of five, backed by bronzy new leaves that turn green in summer and gold in autumn. It has been a top-selling flowering cherry for decades for a reason: when it blooms, the whole tree disappears under pink.

The trade-off is that Kwanzan is a short-lived, disease-aware tree even in its happy zone: susceptible to canker, and best pruned in summer, not winter, to keep wounds healing fast. It is also mostly sterile — no messy fruit, but no cherries either — so buy it for the two-week pink explosion and the gold autumn encore, not for a harvest.

Florida honesty: flowering cherries are zone 5–8 trees, so this is a north-Florida trial at best, never a statewide promise. They need winter chill, suffer in heat and humidity, and are famously short-lived and disease-prone even in their happy zone. In most of Florida, enjoy the blossom pictures and plant something that actually wants to live there; in the far north of the state, a trial in sun, airflow, and well-drained soil is an experiment, not a guarantee.

If you are new to choosing between cultivars, the Varieties Matter guide explains why the name after the plant matters as much as the plant itself. The species guide for Japanese Flowering Cherry covers the species as a whole; this guide is about what makes this one selection different.

How to grow

Plant in autumn or early spring, in full sun, in fertile, moist but well-drained soil — flowering cherries hate wet feet and love airflow. Dig wide, plant at the same depth as the pot, water deeply, and mulch without touching the trunk. Most cultivars are grafted, so watch for suckers from below the graft and remove them promptly, or the rootstock will quietly take over the tree you thought you bought.

Give Kwanzan room for its vase shape: it wants to spread to 30 feet, so do not plant it under wires or against a house and then fight it annually. A lawn tree or a park tree, seen from a distance, is where its scale makes sense — up close, the double flowers repay a bench underneath.

Water & feeding

Water deeply to establish and in dry spells; a flowering cherry in drought drops flowers early and invites disease. Feed lightly in spring — worm castings around the drip line is plenty — because heavy nitrogen grows soft, disease-prone wood. Do not feed after midsummer: late growth does not harden before winter.

Common problems

• Bacterial canker and silver leaf — prune only in summer when wounds heal fast, sterilise tools, and remove infected wood promptly.
• Aphids, caterpillars, and scale on stressed trees — encourage predators, hose off light infestations, and keep the tree vigorous rather than spraying on a schedule.
• Short lifespan and graft failure — flowering cherries are sprinters, not oaks; a 20–30-year tree that flowered gloriously is a success, not a failure.
• Poor flowering in shade or after drought — sun, water, and patience; a cherry in shade is a leafy tree with regrets.

Pruning & enjoying it

Prune Kwanzan in summer, lightly, to remove dead, crossing, or cankered wood and to keep the vase shape open to air — airflow is disease prevention you can see. Do not top it: a topped cherry grows a broom of weak shoots and loses the shape that made it beautiful. Enjoy the blossom the Japanese way, if you like: sit under it, notice it, and accept that two glorious weeks are the point, not a flaw.

Saving seeds

Kwanzan — spelled Kanzan in botanical lists, Kwanzan in American nurseries — is the Japanese flowering cherry most people picture when they hear ‘cherry blossom,’ and it is mostly sterile and grafted, so there is no seed to save — plant a nursery-grown tree in autumn or early spring, and watch for suckers from below the graft and remove them promptly. The Propagation section of the Japanese Flowering Cherry guide covers propagation for the species.