Ornamental · Boraginaceae
Forget-me-not
Myosotis sylvatica
Plant it once for a spring carpet of tiny blue flowers, and it keeps the show going by seeding itself.
Full sun
Every 3–7 days
56–70 days
USDA 3–8
Overview
Those waves of tiny sky-blue flowers weaving around spring bulbs come straight from forget-me-not. It belongs to the borage family and traces back to Europe and Asia, where it grows in damp woodland and along streambanks. In the garden it keeps a low, easy profile, a biennial that flowers in its second spring and then drops seedlings to keep the run going.
What makes it so easy is the same thing that keeps it busy, and that energy is a big part of the appeal. It seeds itself freely and roots from creeping stems, so one planting rolls into a patch and then a colony. That drive pays off beautifully under tulips and daffodils, and it just wants watching where it could break loose into wild ground.
Hand it rich, steadily moist soil and a little afternoon shade in hot regions, and it practically runs itself. The flowers fire up in April and May, with stragglers drifting into summer, and it shrugs off cold like a champ, hardy right down to brutal winter lows.
Care
The short version: load it into rich, consistently moist soil, set it in full sun to part shade with afternoon shade where summers cook, and feed it once at planting. Deadhead after bloom to keep that self-seeding on a leash.
Light
Forget-me-not charges ahead in full sun through partial shade, and it really hits its stride with morning sun and a break from the afternoon where summers turn hot. Run it through heat with too little shade, though, and it sulks and opens itself up to mildew.
Water
Keep the soil consistently moist and never let it bake dry, especially when the heat climbs. It even brushes off the odd spell of wet feet or shallow standing water, so lean toward damp over dry every time.
Soil
Plant it in rich, well-drained loam or clay packed with organic matter and it takes right off. A pH of 6.1 to 7.5 keeps it happy, covering slightly acidic to mildly alkaline, so most garden beds are good to go.
Temperature
This plant is genuinely tough, cruising up to about 86°F (30°C) and surviving winter lows near -40°F (-40°C). Heat trips it up faster than cold ever does, since hot, muggy stretches are what kick off disease.
Humidity
Regular outdoor humidity suits it just fine, and there's no number to hit. Airflow is the real driver, because damp, crowded foliage is exactly where powdery mildew and rust grab a foothold.
Feeding
Forget-me-not isn't a big eater, so keep it light. Work a little balanced fertilizer or compost into rich soil at planting and let it ride, since feeding all season long buys you nothing.
Pruning
Deadhead or shear the spent flower cymes the moment bloom fades to drive more flowers and keep the self-seeding in check. Cut back tired or mildewed foliage in the same go to sharpen the plant right up.
Repotting
It hardly ever needs repotting and usually grows straight in the ground. If you do keep one potted, bump it up only when roots circle or shove through the drainage holes or the soil dries out way too fast.
Size & spacing
These stay compact, hitting 6 to 12 inches (15 to 30 cm) tall and spreading 6 to 10 inches (15 to 25 cm) wide. Give each a little room so air rips through and the leaves dry off fast.
When to plant
Forget-me-not runs on a two-year clock, and once you sync up to it the payoff rolls in. Sow seed indoors 8 to 10 weeks before the last frost for flowers the same year, or scatter it outdoors in mid-summer for bloom the following spring. The big flush hits in April and May, with stray flowers pushing on into summer.
Northern hemisphere
Southern hemisphere
Typical months for a temperate climate: start earlier in warm zones, later where spring frosts linger.
- Sow: 8-10 weeks before the last spring frost for bloom the same year
- Plant: Direct sow in mid-summer for bloom the following spring, or transplant seedlings after frost
- Harvest: April to May, with sporadic intermittent bloom into mid-summer
Hardiness
USDA hardiness zones: 3–8
Temperature: down to -40°C
Troubleshooting
Forget-me-not powers through most seasons without complaint, and the few things that crop up land on the leaves or in its drive to spread. Spot the early signs and a quick move keeps it humming. Match the symptom below, then jump on it before it gets a head start.
Seedlings springing up everywhere and crowding their neighbors
Forget-me-not is a champion self-seeder, and its creeping stems root as they travel to throw up fresh patches. Turn your back and it can swamp a bed and even bust out of the garden. Deadhead the spent flower cymes before seed drops, yank the volunteers you don't want, and lift any rooted runners.
Fix:
- Deadhead and remove flower cymes immediately after bloom to limit seeding
- Pull unwanted volunteer seedlings
- Remove rooted creeping stems to control spread
A dusty white film creeping over the leaves and stems
That white dust is powdery mildew, and it pounces where plants sit crowded in still, humid air. Wipe it off and it just storms back until the air starts moving. Thin or space the plants, water down at the soil line, and shear back the worst of it after bloom.
Fix:
- Improve air circulation by thinning or spacing plants
- Remove and discard severely affected foliage
- Avoid overhead watering and water at the soil line
- Shear back heavily infected plants after bloom
Orange or brown pustules peppering the leaves
Raised rusty bumps on the foliage mean rust, a fungus that takes off when leaves stay wet. Strip and destroy the marked leaves the second you catch them. Keep water off the foliage and open the planting up so the leaves dry fast after rain.
Fix:
- Remove and destroy infected leaves
- Avoid overhead watering to keep foliage dry
- Improve spacing and air movement
- Clean up plant debris at season end
Toxicity
Great news for homes with pets or small children: true forget-me-not is not considered toxic. The NC State Extension Plant Toolbox lists no poison data for it, and the ASPCA skips it entirely. The only thing to nail down is the name, since Chinese forget-me-not is a separate plant that really does pack harmful alkaloids.
Safe for
People · Cats · Dogs · Horses · Rabbits · Livestock · Birds
Cats None
Safe for cats. A curious nibble of leaf or flower won't poison your cat, though a big mouthful of any plant can spark a little drooling or a passing upset stomach.
Dogs None
Safe for dogs. The plant carries no toxin that puts a dog at risk, so a stray bite from the garden is nothing to sweat.
Horses Safe
Safe for horses. True forget-me-not isn't the toxic look-alike, Chinese forget-me-not, so grazing near a patch poses no real danger.
Rabbits Safe
Safe for rabbits, who can browse the foliage without harm. As with any green, ease new plants into the diet slowly rather than all at once.
Livestock Safe
Safe for cattle, goats, and sheep. The species holds only trace alkaloids and isn't flagged as a poisonous pasture plant.
Birds Safe
Safe for birds. Backyard hens and wild visitors can peck at the seeds and foliage with no ill effect.
People Safe
Safe for people, and the small blue flowers even show up as an edible garnish now and then. No need to fence it off from children.
Generally considered safe; as with any plant, discourage pets and small children from eating large amounts of foliage or flowers.
Varieties
Just about every forget-me-not you'll grab at the garden center is a selection of this one species, bred mainly for flower color and shape. Here are the standouts you'll run into most.
Victoria Blue
A compact powerhouse that pumps out rich blue flowers on a tidy, mounded frame.
Victoria Rose
A pink-flowered pick that swaps the usual sky blue for a warm rose.
Snowball
A white-flowered form that pops cool and clean against darker foliage.
Blue Basket
A taller blue-flowered selection that shoots up just above the rest.
Ultramarine
A selection prized for the deep, dark-blue punch of its flowers.
Companions
Forget-me-not earns its keep woven among spring bulbs, where its low blue haze fills the gaps and sets off taller flowers above it.
Plant near
Spring-flowering bulbs such as tulips and daffodils: Forget-me-not is recommended for interplanting with spring bulbs, where its blue flowers complement bulb displays and fill in around them.
How to propagate
Forget-me-not practically multiplies itself, which is half the fun. When you want to steer it, you can fire up a batch from seed or split a clump that's dug in.
SeedEasy
Start indoors 8-10 weeks before last frost for same-year bloom, or sow outdoors in mid-summer for bloom the following spring · Several weeks to germinate and establish; biennial sowings bloom the next season
Seed is the go-to route, and forget-me-not makes it almost too easy. Kick it off indoors 8 to 10 weeks before the last frost for flowers the same year, or scatter it outdoors in mid-summer and let it bloom the following spring. The seedlings take a few weeks to fire up, and once a patch digs in it self-seeds freely, sometimes way more than you bargained for.
DivisionEasy
Spring or after flowering · A few weeks once rooted
Splitting an established clump works too, in spring or once the flowers fade. Those creeping, stolon-like stems root as they spread and crank out clonal offsets, so lift a rooted piece, pull it apart, and replant it. It digs in within a few weeks and grows up to match the parent exactly.
Myths
All forget-me-nots are dangerously poisonous to pets.
Not a chance, at least not the true one. Myosotis sylvatica isn't reported as toxic and stays clear of the ASPCA toxic plant list. The trouble belongs to a whole different plant, Chinese forget-me-not (Cynoglossum amabile), a separate genus whose pyrrolizidine alkaloids can hammer a horse's liver with large or prolonged feeding.
Forget-me-not is a North American native wildflower.
Not so fast, since Myosotis sylvatica is native to Europe and Asia, not North America. It has escaped cultivation and naturalized across parts of the continent, and a few Midwestern areas now treat it as a noxious weed.