Les fleurs de renoncules semblent presque trop parfaites pour être réelles. Les fleurs présentent couche après couche des pétales soyeux aux couleurs vives. Ces fleurs exquises de renoncules, semblables à des roses, sont un élément de base de tout magasin de fleurs ou bouquet de mariage. Dans les régions où les hivers sont doux, les renoncules peuvent être plantées en automne pour une floraison précoce en avril. Dans les régions plus froides, elles peuvent être plantées au printemps pour assurer une floraison précoce en été.
Pre-sprouting
Give your ranunculus flowers a head start by pre-sprouting them. Start with a seed tray that has a flat bottom on it. Fill the tray halfway with potting soil. Make sure it is moist and not too dry. Then, take your soaked ranunculus corns and spread them out over the soil.
Finally, cover them with more soil and leave them for 10 to 14 days. The tray should be in a cool place. As you wait, add a bit more soil to ensure it stays moist but not overly wet. After this, you should see small rootlets which resemble white hairs. Once they appear, it is time to transplant them into your garden.
Regular planting and care
Start with a well-draining potting soil with plenty of organic matter. Soak the corms for half a day before planting.
Plant the claws pointing downwards at a depth of 5 cm from the surface of the soil, spacing them 15 to 20 cm apart, depending on the desired effect. They can be planted both in containers or in the garden, so you can enjoy their blooms indoors and out.
During the growing season, water regularly in hot and dry weather, letting the substrate dry between waterings. Add a special flowering plant fertilizer every two weeks during the flowering period. Cut off spent flowers after blooming to induce the formation of new flowers. Do not cut the foliage.
In cold regions, dig up the corms in autumn and store them throughout the winter in sawdust, protected from frost, in a cool, dark place. In other regions and in well-drained soil, they can be left in the ground.
Autumn & winter care
Autumn-started ranunculus corms generally will reach a taller height than spring-sewn ranunculus. When planted in the fall, they'll bloom from the end of March through April, usually finishing around the beginning of May.
In areas with mild winter temperatures (USDA zone 7 & above), you can plant your ranunculus corms in autumn and overwinter outdoors with protection from a low tunnel or frost cloth. In colder areas (USDA zone 6B & below), ranunculus must be grown in a minimally heated hoop house or planted out at the end of winter/early spring.
Ranunculus will need frost protection throughout the winter as they cannot tolerate freezing temperatures. They can be grown in a sunny place or in half-shade in a situation sheltered from heavy frost (resists up to -7 °C).
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