Ranunculus – Lemon- 10 corms
Ranunculus – Lemon
Yellow flowers in your garden are either a love or a definite no-go. For all the yellow lovers amongst us, ranunculus Lemon is for you! (And a bit for us because we are team Lemon!) If you plant them in the autumn you can use this flower together with other spring flowers in your eastern table piece. The big and soft flowers slightly vary in their lemon tone. Despite ranunculus having a bad name for being a more diva plant that is hard to grow, I would definitely let the flowers speak for themselves and give them a try.
If you like to grow them together you can sign up for a free e-mail course. You can sign up for October, February, or both.
Planting information to grow ranunculus Lemon mix:
Plant type: half-hardy annual or short-lived perennial
Height: 40 – 50 centimeters
Position: full sun or partial share
Start: autumn and/or late winter
Number of days until plants bloom: 90-100 days
Distance between the plants: 25-30 centimeters
Germination: 14 days at 10-15 °C
Flowers: March to June depending on the weather
Number of corms per pack: 10, Large size
Number of stems: 3 – 6 depending on the growing conditions
When do I start my ranunculus?
Autumn start: You can start your ranunculus in the Autumn. Based on your location or climate you can start them in a greenhouse or cold frame in seed trays, or, if your winters are mild pre-sprout them and plant them out in the garden. Plant out in a greenhouse or low tunnel in late January to flower in March if your climate is cold (like The Netherlands). Or plant outdoors but protected from heavy rain around the end of February. If the temperature drops below -6 C. you will have to protect the plants with horticultural fleece. If your climate has dry and mild winters you won’t have to protect plants.
Late winter start: If your climate is cold and wet, like ours (The Netherlands) and you don’t have a greenhouse or don’t like the hassle in the winter to care for all the plants then this is the best moment for you. Plant in late winter (beginning of February) in seed trays or P9 flower pots. Grow them in a greenhouse, polytunnel, or propagator to protect against heavy rainfall. After your plants are of sufficient size and the weather is getting milder you can plant your ranunculus in the garden. for our climate, this is around the middle of March. Your plants will start to flower in May.
Keep in mind that this ranunculus is a cut flower variety that will go into dormancy when the temperatures rise and summer arrives. Therefore you can not start your corms too late. This is a cool weather variety of ranunculus.
The rule of thumb is to space them about 20 to 25 cm apart. I plant 4 plants next to each other on a 75 cm flower bed with 4 to 5 per 1-meter bed length. Keep the same space in mind when you grow them in pots! Don’t put too many young plants in a pot because they will grow much bigger.
How do you grow ranunculus successfully?
You start your ranunculus corms by soaking them in water for 6 hours. When you get the corms they are dried for good storage. To wake them up you soak them and they become a lot bigger. They might look small when they arrive but once they start growing you will see that the corm becomes at least 2 to 3 times the original size. Don’t soak them too long because they will go bad. Set an alarm so you don’t forget to take them out. It happened to me once.
After you soaked the corms plant them in potting soil with perlite. Free draining and airy soil are important to prevent rotting. We use the 40 cells tray for spring-started corms and the 28 cell propagation tray if we grow them over winter in our greenhouse. You can also use the P9 plant pots or the 15-cell large tray. Ranunculus don’t do well when they are root bound or have a lack of nutrients. Plant the ranunculus with the octopus legs down. A thin layer of topsoil is enough to cover them. If you notice that the plants stop growing or the soil is full of roots you can pot them on into bigger pots.
Store your planted corms in a room or cellar where you can keep the temperature between 10°C and 15°C. It takes around 2 weeks for the corms to start growing. Once you see the first shoots coming up you can grow them on a greenhouse or other light place but not on a windowsill. A greenhouse, propagator, grow tent, grow rack with plastic cover, or polytunnel is ideal. Fresh corms can be eaten by rodents! Once the corms have grown leaves and roots it’s no longer an issue.
Plant them out in free-draining soil when the plants have filled their cell or pot. If your winters are cold you need to cover the plants with frost protection below -8°C. The foliage is very thick and full of water. Therefore the leaves don’t do well when they get frost damage. The ranunculus flowers are not frost resistant. If they get frozen you can cut them back and the plants will put energy in new stems.
When do you pick ranunculus flowers?
The flowers are ready to pick when they feel soft. They might look small but the flower will open in the vase. Refresh the water regularly and the flower will last up to 10 days!
Ranunculus are suitable to grow in pots. Plant a maximum of 3 plants in a 15-liter size container. Do give them regular plant nutrition and start with fresh potting soil. Make sure that the soil does not dry out completely. Keep in mind soil in pots eat up faster. Don’t put too many plants in one pot. They might look small at first but your plants will still grow a lot. If you put too many in one pot they will stop growing. Healthy plants will become 25 to 30 cm in diameter.
For more detailed information on how to start ranunculus, I recommend reading our blog
15 – 20 cm
45 – 60 cm