Ranunculus ((Ranunculus asiaticus) flowers are a favorite among gardeners for their delicate, rose-like blooms in a variety of colors. These are cool season plants. If you want a garden full of these lush, layered flowers, you’ll need to start ranunculus bulbs, also known as corms in November- December for spring blooms. They bloom in April- May for about 4-6 weeks.
Temperature for Ranunculus
The optimal temperature for the growth and blooming is between 57 to 64°F during the day and 40 to 50°F at night. They can survive at temperatures as low as 26°F. As mentioned earlier, ranunculus are cold season plants. The flower production doesn't at higher temperatures above 80°F.
Choosing Your Ranunculus Corms
Healthy ranunculus corms, look for firm, plump corms rather than shriveled or overly dry. Larger corms are typically from older more mature plants, hence more is the flower production. Popular varieties include the Tecolote and Amandine series, both known for their vibrant colors and sturdy stems. Ranunculus comes in a variety of colors and shades. Some are even of mixed colors. Pick the ones that suit your garden. It is a challenging to limit yourself when it comes to pick the colors of these beautiful flowers.
Pre-Soaking for Best Results
Before planting, soak the ranunculus corms in room-temperature water for 3 to 4 hours. This helps rehydrate the corms and jumpstarts the growth process. During soaking, the corms will expand, so be sure not to over-soak, as excessive water can lead to rot.
Starting Indoors vs. Direct Planting
Ranunculus thrive in cool weather, making them ideal for early spring or fall planting, depending on your climate. They are hardy in USDA zones 8-10.
Starting Indoors/ Pre-sprouting
For colder climates, it’s best to start corms indoors about 6 to 8 weeks before the last frost. Plant them in trays or starter pots filled with well-draining soil, keeping them in a cool, bright location (around 50°F/10°C). Once they sprout, gradually acclimate them to outdoor conditions before transplanting.
Direct Planting: If you live in a milder climate, you can plant corms directly in the ground in the fall or early spring. Choose a well-draining location with full sun to ensure healthy growth.
Planting Your Corms
When planting, position the corms with their claw-like tips facing downward. Space them about 4 to 6 inches apart and plant them 1 to 2 inches deep in soil rich in organic matter. Water lightly after planting but avoid overwatering to prevent rot.
Caring for Your Ranunculus
Once the corms sprout, keep the soil moist but not soggy. Ranunculus plants appreciate regular watering, but good drainage is crucial. Feed them with a balanced, slow-release fertilizer or liquid fertilizer every few weeks to encourage strong growth and abundant blooms.
Enjoying Your Blooms
Ranunculus typically bloom in late spring, producing vibrant flowers that last several weeks. Cutting the blooms regularly encourages more flowers to form. If you want to save your corms for the next season, allow the foliage to die back naturally, then lift and store the corms in a dry, cool place.
Harvesting Ranunculus
Harvest during morning or late afternoon when the flowers in a 'marshmallow stage', when the flowers are not fully open. The bud should be partly open and the flower should have opened and closed for up to three days.
With a little preparation and care, you can enjoy a stunning display of ranunculus flowers in your garden. Happy planting!