Few spring flowers look quite as extravagant as ranunculus. Their blossoms are composed of layer upon layer of delicate petals, packed so closely together that a fully opened flower can resemble a small rose or peony. The colors range from pure white and cream to yellow, apricot, salmon, pink, orange, scarlet, burgundy, and nearly every shade between.
Yet beneath all that finery is a surprisingly modest plant. Ranunculus are not difficult to grow if their basic requirements are understood. They prefer cool weather, abundant sunshine, good drainage, and—most importantly—planting at the proper time.
For gardeners who enjoy spring bulbs, ranunculus deserve a place alongside tulips, daffodils, anemones, and other old favorites.
What Is Ranunculus?
Ranunculus is a large genus in the buttercup family, Ranunculaceae. In fact, our familiar wild buttercups are ranunculus.
The showy plants sold for gardens and cut flowers are usually forms of Persian buttercup, Ranunculus asiaticus. The species is native to the eastern Mediterranean region and neighboring parts of southwestern Asia.
Centuries of cultivation have transformed the relatively simple wild flower into the remarkably full, many-petaled varieties we grow today.
Modern garden ranunculus may produce flowers several inches across, often on stems 12 to 18 inches tall. Their fern-like foliage forms a low mound beneath the flowers.
Ranunculus Have a Long Garden History
Ranunculus are hardly newcomers to ornamental gardening.
Persian and Turkish forms attracted European attention centuries ago, and by the 17th and 18th centuries ranunculus had become prized garden flowers. Florists and nurserymen selected increasingly elaborate forms and colors, much as they did with tulips, carnations, and auriculas.
Their popularity has risen and fallen over the centuries, but the flower itself never lost its charm.
Today ranunculus are enjoying another well-deserved period of popularity, particularly as cut flowers.
Those Curious Ranunculus "Bulbs"
Ranunculus are frequently sold with spring-flowering bulbs, but what you receive in the package isn't actually a bulb.
Ranunculus grow from tuberous roots, usually called corms by gardeners and in the nursery trade.
They are unmistakable.
A dormant ranunculus corm looks rather like a tiny dried octopus, claw, or bunch of miniature bananas. It hardly seems possible that such a shriveled object could produce an elegant flower.
It can—and remarkably quickly under the right conditions.
When Should Ranunculus Be Planted?
This is the most important question because ranunculus are cool-season plants.
In climates with mild winters, ranunculus can be planted in autumn for flowers the following late winter or spring.
That makes fall planting particularly useful throughout much of the South, provided the winter is not severe enough to damage the plants.
In colder climates, plant ranunculus in late winter or early spring, timing them so that they can grow and flower during cool spring weather.
Ranunculus do not particularly enjoy summer heat. Once genuinely hot weather arrives, the plants naturally begin to decline and enter dormancy.
Think of them as flowers of the cool, lengthening days of spring rather than summer bedding plants.
Should Ranunculus Corms Be Soaked Before Planting?
Yes. Soaking is generally beneficial.
Place the dry corms in room-temperature water for about three to four hours before planting. They will gradually swell as they absorb moisture.
There is no need to soak them overnight. Excessively long soaking can encourage rot.
Some professional flower growers pre-sprout their ranunculus before planting, but the home gardener usually needn't make matters complicated. A few hours of soaking followed by planting in properly prepared soil works well.
Which Way Do the Claws Point?
Unlike anemone tubers, ranunculus make the answer fairly easy.
Plant the corm with the claws pointing downward.
The flatter central portion belongs toward the surface, while the little finger-like projections point into the soil.
It may look as though you're burying a miniature squid headfirst. That is nevertheless the correct arrangement.
How Deep Should Ranunculus Be Planted?
Plant the corms approximately 2 inches deep, generally spacing them about 4 to 6 inches apart.
For a lush display in containers or a dedicated cutting bed, they can be planted fairly closely.
Cover them gently with soil and water after planting. Thereafter, avoid keeping the ground continually saturated.
Ranunculus need moisture while actively growing, but their corms are susceptible to rot in soggy conditions.
Sun and Soil Requirements
Ranunculus perform best in full sun.
Give them at least six hours of direct sunlight if possible. In warmer climates, a location receiving morning sun and some protection from intense late-afternoon heat can also work well.
Good drainage is essential.
A loose, fertile sandy loam enriched with compost is excellent. Heavy clay soils should be improved, or ranunculus can be grown in raised beds or containers where drainage can be controlled more easily.
If water routinely stands in the planting area after rain, choose somewhere else.
Ranunculus would rather have slightly lean, well-drained ground than luxurious mud.
Growing Ranunculus in the Southern Garden
Southern gardeners have one considerable advantage with ranunculus: our relatively mild winters can permit the plants to establish themselves during the cool season.
But there is also a disadvantage.
Spring can turn into summer with indecent haste.
For that reason, autumn planting is often preferable in warmer parts of the South. It gives the plants time to develop roots and allows them to begin growing while temperatures remain favorable.
The objective is to have them flowering before serious heat arrives.
In areas subject to occasional hard freezes, some protection may be necessary during unusually cold spells. A layer of mulch, frost cloth, or temporary protection can save tender emerging growth.
Growing Ranunculus in Containers
Ranunculus are exceptionally good container plants.
Terra-cotta pots are particularly handsome with them, and the excellent drainage provided by unglazed clay suits their preferences.
Choose a container with drainage holes and fill it with a high-quality, free-draining potting mix. Plant several corms together rather than trying to make one lonely plant carry the entire performance.
Containers also have a practical advantage: they can be moved.
If severe cold threatens, pots can temporarily be placed in a protected location. As flowering begins, they can be moved to porches, patios, entrances, or other places where their blossoms can be enjoyed at close range.
Watering and Feeding
After growth begins, keep the soil evenly moist but not wet.
Ranunculus should not be allowed to become bone dry while actively growing and flowering, but overwatering is considerably more dangerous than occasional slight dryness.
A light application of balanced fertilizer during active growth can encourage vigorous plants and abundant flowers.
Avoid excessive nitrogen. Too much produces lush foliage at the expense of flowers.
Ranunculus Make Superb Cut Flowers
One of the best reasons to grow ranunculus is to bring them indoors.
Their long stems and densely layered flowers make them among the finest spring flowers for cutting. They are widely grown commercially for precisely this purpose.
Harvest flowers when the buds have developed good color and are beginning to open but are not yet fully expanded.
Cut them during the cool part of the morning with clean, sharp snips and place the stems immediately in water.
Frequent cutting can also encourage the plant to continue producing flowers.
Deadheading Ranunculus
If you aren't cutting the flowers for arrangements, remove faded blooms before they begin producing seed.
Deadheading directs the plant's energy toward continued flowering rather than seed production.
But once the entire flowering season is finished, don't immediately remove the leaves.
Allow the foliage to remain until it begins to yellow naturally. The leaves are feeding the underground corm and preparing it for dormancy.
What Happens When Summer Arrives?
Ranunculus naturally die back as temperatures rise.
Yellowing foliage after flowering is therefore not necessarily evidence that something has gone wrong. It is part of the plant's normal cycle.
Once the foliage has died, reduce watering.
In climates where the corms can safely remain in well-drained soil, they may be left undisturbed during dormancy. Elsewhere, gardeners often lift the corms after the foliage has completely died.
Allow lifted corms to dry, clean away excess soil, and store them in a cool, dry, well-ventilated place until the next planting season.
Will Ranunculus Come Back Every Year?
They can, but the answer depends considerably upon climate.
Ranunculus asiaticus is naturally perennial, but it isn't reliably hardy everywhere. In favorable mild climates with excellent drainage, corms may survive in the ground and return.
In colder regions, they are commonly treated as tender perennials or even as annuals.
Hot, wet summers can also be troublesome because dormant corms are vulnerable to rotting.
For gardeners determined to preserve particular varieties, lifting and storing the corms after dormancy is the safer approach.
Planting Ranunculus With Other Spring Flowers
Ranunculus fit beautifully into a traditional spring garden.
Plant them with anemones for an especially handsome combination. The open, dark-centered flowers of Anemone coronaria contrast wonderfully with the densely layered ranunculus blossoms.
They also combine well with tulips, daffodils, violas, pansies, snapdragons, and other cool-season flowers.
Because ranunculus are available in such a broad range of colors, the planting can be restrained or exuberant.
White, cream, blush, and pale apricot make an elegant garden. Scarlet, orange, yellow, purple, and hot pink announce spring rather more loudly.
There is room for both approaches.
A Remarkable Flower From an Unremarkable Beginning
Perhaps the greatest pleasure in growing ranunculus is the transformation.
In autumn or early spring, you hold a dry little claw in your hand. It appears lifeless and not particularly promising. You soak it, bury it a couple of inches beneath the earth, and wait.
Then come the finely divided leaves. Stems rise above them. Tight round buds appear.
And finally those buds unfold into flowers containing seemingly impossible numbers of petals—great silken rosettes of cream, apricot, rose, scarlet, yellow, or burgundy.
Plant the claws downward, give them sunshine and cool weather, keep their feet out of soggy soil, and let them do the rest.
For something that begins life looking so much like a dried spider, the ranunculus finishes the season with considerable dignity.






