Tree · Arecaceae
Windmill Palm
Trachycarpus fortunei
Hardy right down to single digits, the windmill palm hands you a true tropical look in gardens far too cold for most palms.
Partial shade
USDA 7–10
8–40 ft · 2.4–12.2 m
Overview
If you have longed for a real fan palm but assumed your climate ruled it out, the windmill palm is the one that says yes. It grew up in the mountains of central and eastern China, and that high-altitude home is exactly why it laughs off cold that would finish other palms, holding on down to 5°F (-15°C). The stiff, rounded fans open out like the blades of a windmill, which is how it earned its name.
It rises on a single slim trunk wrapped in coarse brown fiber, and it takes its time, often gaining only a few inches a year. Given decades it can climb to 8 to 40 feet (2.4 to 12 m), though most garden plants stay comfortably shorter, so there is no rush. It settles in happily as a hardy landscape tree across USDA zones 7 to 10, in a big container, or under glass in a cool conservatory.
This really is the palm for anyone who wants the look without the worry, and it asks very little once it has found its feet. Give it decent soil, steady moisture, and a little shelter from harsh wind, and it will keep going for years while barely noticing you are there.
Care
The short version: part shade to full sun, rich and well-drained soil kept evenly moist but never waterlogged, a slow-release palm feed through the growing season, and a sheltered spot away from cold, drying winds.
Light
Your windmill palm is happiest in partial shade and grows into full sun once it has established. Light to medium shade suits it beautifully, and a young plant in particular will thank you for keeping it out of the fiercest midday glare.
Water
Offer it regular, ample water in soil that stays evenly moist yet drains freely, and you will both be content. An established palm can ride out a moderate dry spell, but it truly will not tolerate standing water or a high water table, which is what leads to rotting roots.
Soil
Plant it into rich, fertile, well-drained loam and it settles in with ease. A pH anywhere from 6.0 to 7.5 is perfectly welcome, it takes sand and many other soils in stride, and it even shrugs off moderate salt, which is a lovely bonus in a coastal garden.
Temperature
This is the hardiest trunked palm you will find, weathering cold down to 5°F (-15°C) and heat up to 104°F (40°C). That generous range is exactly what lets it live outdoors well past the usual palm country, though a young one still welcomes a bit of winter shelter.
Humidity
You do not need to chase any humidity number, since ordinary outdoor air is all it asks for. Far more helpful is simply giving it shelter from cold, drying wind, which does it a world of good.
Feeding
Feed it through the growing season, spring into early fall, with a slow-release palm fertilizer that carries micronutrients like manganese, magnesium, and iron. Palms tend to run short on nitrogen, potassium, magnesium, and manganese in sandy ground, so the right feed quietly heads off the deficiencies that would otherwise yellow the fronds.
Pruning
Happily, there is barely any pruning to do. Take off only the fully dead, browned lower fronds and spent flower or fruit stalks, and please never cut a healthy green one. You can tidy loose trunk fiber if you like the look, but leave the growing point at the crown completely alone.
Repotting
A container plant appreciates a roomier pot every 2 to 3 years, or sooner if it turns rootbound. Mature landscape specimens are simply left in the ground, so this only matters while your palm is still living in a pot.
Size & spacing
Over many patient years a windmill palm reaches 8 to 40 feet (2.4 to 12 m) tall, with a crown spreading 4 to 6 feet (122 to 183 cm). Because it grows so slowly, you have plenty of time, so pick its spot with the long haul in mind.
When to plant
There is no planting season to stress about, since the windmill palm grows slowly all year rather than by the calendar. What it does keep is a gentle bloom-and-fruit rhythm: yellow flowers open in early summer, and on female plants the dark drupes ripen from late summer into fall.
Northern hemisphere
Southern hemisphere
Typical months for a temperate climate: start earlier in warm zones, later where spring frosts linger.
- Harvest: Yellow flowers on drooping panicles in early summer (June to July); dark blue to nearly black drupe fruits ripen on female plants in late summer to fall.
Hardiness
USDA hardiness zones: 7–10
Temperature: down to -18°C
Troubleshooting
The windmill palm gives you very little to fret over, and most of what does appear is cosmetic or easy to head off early. Keep a friendly eye on the fronds and the drainage, since that is where any warning shows up first. Find your symptom below and step in gently before a small thing settles in.
Wilting and crown decline while the soil stays soaking wet
A palm that droops in soggy ground is telling you the roots are drowning, and the trouble is root rot. When roots sit in standing water or a high water table they turn soft and dark and simply stop feeding the plant. The good news is you can turn this around: open up the drainage, water more sparingly, and keep the palm out of any low spot where runoff pools.
Fix:
- Improve drainage and reduce supplemental watering
- Avoid planting in low spots that collect water
Sticky fronds with a black film and little bumps you can feel
You are looking at scale insects or palm aphids, and they are very manageable. As they feed they drip a sticky honeydew that a black sooty mold settles onto, and the culprits show up as tiny hard bumps or soft clusters tucked along the tops and undersides of the leaves. Wipe them off with horticultural oil or insecticidal soap, and only remove a frond if it is truly overrun.
Fix:
- Treat with horticultural oil or insecticidal soap
- Remove heavily infested fronds
Yellow, frizzled fronds turning up on the newest growth
This is usually just a nutrient deficiency, most often manganese, potassium, or magnesium, and it shows first as discolored, distorted new fronds. Sandy soils are the ones that run short fastest, so do not take it personally if yours does. A slow-release palm fertilizer carrying micronutrients sorts it out, and feeding it steadily over time works far better than trying to fix everything with one big dose.
Fix:
- Apply a slow-release palm fertilizer containing micronutrients
- Correct deficiency on a regular schedule rather than a single dose
When your fronds start tearing along the leaf segments
Take a breath, because this is only wind damage and not a disease at all. Cold, drying gusts catch those wide fans and split them along the folds they already have, so it looks worse than it is and the palm keeps growing just fine. Ease a potted plant into a sheltered corner or slip a windbreak in front of it, and snip away only the fronds that are truly ragged or dead.
Fix:
- Provide a windbreak or relocate to a more sheltered position
- Trim only the most badly damaged or fully dead fronds
Toxicity
Here is the reassuring part for animal-loving homes: the windmill palm is non-toxic straight down the line. It is a true palm, not the poisonous sago palm it gets muddled up with, so there is no cycasin or any other toxin waiting to trouble your pets, your livestock, or your children.
Safe for
People · Cats · Dogs · Horses · Rabbits · Livestock · Birds
Cats None
You can relax about the cat. The ASPCA lists the windmill palm as non-toxic, so a curious kitty swatting at the fans has nothing to worry about.
Dogs None
Dogs are perfectly fine here. It holds the ASPCA non-toxic listing, so even a pup that gnaws on a frond will come to no harm.
Horses None
Horses are safe too, since NC State Extension reports the windmill palm as non-toxic to horses, making it an easy plant to keep near the paddock.
Rabbits Safe
No need to fret over the rabbits. Nothing in this true palm is known to hurt them, so a stray nibble is nothing to lose sleep over.
Livestock Safe
Your cattle, goats, and sheep can browse right beside it without any trouble, because the plant carries no toxins that would bother them.
Birds Safe
Birds are welcome around it. Both the fronds and the ripe fruit are harmless, whether you keep backyard visitors or a pet bird indoors.
People Safe
It is gentle enough for the whole family, children included. This is the true palm, not the toxic sago it gets mistaken for, so a handled frond does no harm at all.
Often confused with the highly toxic sago palm (Cycas revoluta); the true windmill palm is a different, non-toxic plant.
Varieties
Only a couple of named windmill palms tend to show up in gardens, and each one was chosen for a practical reason rather than for show.
Trachycarpus fortunei var. wagnerianus ('Waggie')
Its leaves are stiffer, smaller, and more tightly held, so it stands up to wind far better than the ordinary species and becomes the obvious pick for an exposed, breezy corner.
Trachycarpus fortunei 'Nanus'
This is a dwarf form that settles in noticeably shorter than the usual windmill palm, which is a real gift when you simply do not have the headroom.
How to propagate
There is really just one way to raise more windmill palms, and it leans on patience far more than any special skill.
SeedModerate
Sow fresh, cleaned ripe seed in spring at its own depth in a moist, free-draining medium. · Seed germinates in roughly 1 to 3 months; several years are needed to develop a visible trunk.
Seed is your only route to new plants, and you will need both a male and a female palm for that seed to be viable. Sow fresh, cleaned seed in spring at its own depth in a moist, free-draining mix, and it comes up in 1 to 3 months. The one thing it asks of you is patience, since it takes several years to raise a trunk you can actually see. Because this is a solitary, single-trunked palm, it never sends up pups or offsets, and it will not root from a cutting, so seed really is the way.
Myths
The windmill palm is the same as the sago palm and just as poisonous.
You can set that worry aside, because the two are not even related. The sago palm (Cycas revoluta) is a cycad and truly toxic, while your windmill palm is a genuine palm in the family Arecaceae. The ASPCA lists the windmill palm as non-toxic, so there is no reason to treat them as the same plant.