Ornamental · Goodeniaceae
Fan Flower
Scaevola aemula
Plant it in full sun with sharp drainage and fan flower rockets out blue blooms all season long.
Full sun
Every 3–7 days
64–95°F · 18–35°C
USDA 10–11
Overview
Fan flower puts on a show that lives up to its name, with one-sided, fan-shaped blooms marching down every trailing stem. It hails from Australia, so it storms into the garden tough and heat-hungry, thriving in beds, borders, and hanging baskets. The flowers roll out in cool blue, violet, and the odd pop of pink, and they keep firing all season long.
Most growers run it as a warm-season annual, and it makes the most of every week of it. Deep down it is a tender perennial, hardy only in zones 10 and 11, so nearly everywhere else it goes in come spring and blazes away until the first frost calls it. That fits its style perfectly, since it throws its whole party into one long summer.
Best of all, it barely asks for anything once it takes hold. Full sun, quick drainage, and a steady feed keep it charging along, and the self-cleaning flowers drop the spent blooms for you, so deadheading never makes the list. The only misstep to dodge is wet feet, which is the one thing that stops it cold.
Care
The short version: full sun and well-drained soil, water once the top of the soil dries, and hit it with a balanced feed every couple of weeks through the growing season.
Light
Park fan flower in full sun and it flowers its heart out. A little afternoon shade is fine, but drop it into deep shade and it stretches thin and blooms poorly, so chase the brightest spot you have.
Water
Water it every 3 to 7 days through the growing season, then let the top of the soil dry before the next go. It powers through a dry spell far better than it takes soggy roots, so lean dry and it stays happy.
Soil
Get it into average, well-drained loam with some organic matter worked in. It shrugs at pH anywhere from 6.0 to 8.0, but nail the drainage and you have won half the battle.
Temperature
It thrives on warmth, cruising along between 64°F and 95°F (18°C to 35°C) and laughing off summer heat. Frost is the wall it hits, which is why cooler zones run it as an annual.
Humidity
Skip the humidity worries, since ordinary outdoor air is all it needs. It powers right through a humid, muggy summer without slowing down.
Feeding
Feed it a balanced liquid fertilizer every couple of weeks while it is growing to keep the flowers coming. Steer clear of high-phosphorus blends, which this plant just does not want.
Pruning
Pruning barely registers. Pinch back leggy stems to keep it dense and bushy, and since the flowers clean up after themselves, you can leave the deadheading behind for good.
Size & spacing
Plants shoot up to about 9 to 18 inches (23 to 46 cm) tall and fan out 12 to 24 inches (30 to 61 cm) wide. That trailing spread is exactly what sends them tumbling over the edge of a basket or wall.
When to plant
Fan flower runs on heat and quits at frost, so most gardens race it through as a summer annual. Kick things off by sowing seed indoors 6 to 8 weeks before your last frost, then send plants outside once the soil climbs to 65°F (18°C). From there it powers out flowers from summer clear up to frost.
Northern hemisphere
Southern hemisphere
Typical months for a temperate climate: start earlier in warm zones, later where spring frosts linger.
- Sow: 6 to 8 weeks before the last frost date
- Plant: In spring after the last frost when soil temperatures reach 65°F (18°C)
- Harvest: Summer through first frost
Hardiness
USDA hardiness zones: 10–11
Temperature: down to -1°C
Troubleshooting
Fan flower is a champ, and almost every hiccup traces straight back to too much water or too little sun. Keep a close eye on the roots, stems, and flowers and you can jump on trouble early, before it slows the plant down. Spot your symptom below and get after it.
Wilting, yellowing leaves and soft brown roots
Wilting, yellowing leaves over soft brown roots spell root rot, and wet soil is nearly always the culprit. Roots that never get to dry suffocate and break down fast. Pull back on the watering, fix the drainage or shift the plant into a fast-draining mix, and clear out anything that has already collapsed.
Fix:
- Reduce watering frequency
- Improve drainage or replant into well-drained media
- Remove severely affected plants
Cottony white tufts and sticky film on the stems
Those cottony white tufts crowding the leaf joints, plus a sticky film, are mealybugs, sap-suckers that feed on the stems. Blast them off with a hard jet of water, then hit the survivors with insecticidal soap or horticultural oil. Scout new plants before they join the lineup and give everything room so air keeps moving.
Fix:
- Wash off with a strong spray of water
- Spot-treat with insecticidal soap or horticultural oil
Thin bloom on long, floppy stems
Skimpy flowers on long, floppy stems flag too little light or too little feeding. A shaded or unfed plant stretches out and drops off the blooms. Push it into full sun, feed it through the season, and pinch those leggy stems to fire up fresh branching.
Fix:
- Move to a full-sun location
- Fertilize regularly during the growing season
- Pinch back leggy stems to encourage branching
Toxicity
Here is a win for pet owners and parents: fan flower is not toxic. Nothing in the leaves or flowers will poison a cat, dog, rabbit, bird, grazing animal, or child, so you can pack a basket by the door or fill a bed the whole crew wanders through and just enjoy the color.
Safe for
People · Cats · Dogs · Horses · Rabbits · Livestock · Birds
Cats None
Cats are in the clear with it. A nibble will not poison one, though piling into any plant can leave a cat with a briefly upset stomach.
Dogs None
Dogs are safe around it too. The worst a chewed stem is likely to bring on is mild, passing stomach upset.
Horses Safe
Horses can graze right beside it with zero risk, since fan flower packs nothing poisonous to them.
Rabbits Safe
Rabbits are perfectly safe in the foliage, and a stray bite does no harm at all.
Livestock Safe
Cattle, goats, and sheep can work a pasture with it safely, since it holds no compounds known to harm grazing stock.
Birds Safe
Backyard and pet birds face no danger from it, with nothing toxic tucked in the leaves or flowers.
People Safe
It is not poisonous to people. It is grown flat-out for its flowers, not for eating, so keep it off the plate.
Varieties
Fan flower comes in a handful of standout selections, sorted mostly by flower color and how far they trail. These are the ones you will want to hunt down.
Blue Wonder
Blue Wonder fires out cool blue to violet fan flowers nonstop on long trailing stems, a knockout in any hanging basket.
New Wonder
New Wonder trails hard and fast, loading up on a heavy show of blue-lavender fan flowers.
Pink Charm
Pink Charm keeps it compact at about 4 inches tall and 5 inches wide and bursts with soft pink blooms.
How to propagate
Fan flower multiplies fast and easy, whether you snip a cutting or start a tray of seed.
Stem cuttingsEasy
During the growing season · A few weeks to root
The fastest track is a stem cutting taken in the growing season, which roots in just a few weeks and hands you a clone of the parent. Rather sow seed? Start it indoors 6 to 8 weeks before your last frost.
Myths
You have to deadhead fan flower to keep it blooming.
Not a chance. The old flowers let go on their own, so there is zero spent-bloom cleanup to chase. Fan flower cleans up after itself, and the only trim it ever wants is a quick pinch of a stem that has run long.
Fan flower needs rich, always-moist soil to take off.
It is the opposite. This plant hits its stride in well-drained soil and powers through heat and drought once established. Keep it soggy and the roots rot, which is the quickest way to lose it.