When to Start Ranunculus Indoors: A Guide to Growing Gorgeous Ranunculus from Seeds

A ranunculus garden will provide the most beautiful look to your outdoor space. Growing ranunculus from corms indoors will assure you will have many flowers with a head start. We will talk about whether they are hard to grow, what plants do well with ranunculus, whether they only bloom once, and whether they spread quickly so that you can successfully grow ranunculus in your garden.

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Every time I write a blog post, I remember how close spring is getting, and it makes me happy. We’re making some changes to our little garden so that this year we can grow even more flowers. We will be adding more raised garden beds and making the most of every square inch of space we have. My hubby is ready to dig in, well, maybe not that ready. LOL! Read my story in GARDEN WITH PURPOSE | Gardening Changed my Life. You’ll learn why I love gardening so much and feel connected to every flower I grow.

It is common knowledge that I am a little obsessed, okay, maybe a ton obsessed, with growing dahlias. Ranunculus flowers are in the top five on my list of things I want to grow, so I need to tell you everything I know about them. There are a lot of flowers on the list, but this delicate, sophisticated bloom is like no other.

Okay, get ready to learn about the ranunculus flower, so incredibly gorgeous. To me, what makes it so special is the delicate flowers, even more, delicate than roses. These flowers come in both soft and bright colors, which makes them perfect for making bouquets. The best news is that they grow so easily indoors from corms.

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With their ruffled, rose-like blooms in shades of pink, red, yellow, white and purple, ranunculus flowers are showstoppers in any garden While ranunculus thrive outdoors in mild climates, you can also get a head start on these beauties by starting them indoors Read on to learn when and how to sow ranunculus seeds indoors for healthy transplants ready to dazzle in your garden.

Ranunculus Growing Conditions

Ranunculus prefer cool conditions and do best in zones 8-10 where winters are mild. They can be grown as annuals in zones 4-7 given proper care. Established plants can tolerate light frosts but prolonged freezes will kill them.

This Mediterranean native thrives in well-draining, slightly alkaline soil. Amend soil with compost to improve drainage. Ranunculus also require at least 6 hours of direct sun daily. Shelter plants from hot afternoon sun to prevent scorching.

When to Start Ranunculus Seeds Indoors

Starting ranunculus seeds indoors gives you a jump on the season. You can enjoy earlier blooms compared to direct sowing outdoors.

The timing depends on your desired transplant date based on your local last spring frost date. Count backwards from your target transplant date:

  • 8-10 weeks for seedlings grown in individual pots
  • 12-14 weeks if direct sowing seeds in flats

Here are some general guidelines for indoor sowing dates:

  • January to February: For transplanting outdoors in March/April
  • March: For transplanting in May
  • July: For growing as fall annuals and transplanting in September/October

Stagger sowings every 2-3 weeks for a longer flowering window.

How to Grow Ranunculus Indoors from Seeds

Follow these steps for success with starting ranunculus from seed:

Use Fresh Seeds

Check seed packet dates and germination rates. Discard old seeds as germination declines over time. Opt for fresh seeds with at least an 80% germination rate.

Plant in Seed Starting Mix

Fill containers with sterile, soilless seed starting mix. Gently firm the mix and water thoroughly before planting.

Sow Seeds Shallowly

Ranunculus seeds need light to germinate. Simply press seeds into the soil surface without covering them.

Maintain Moisture

Water lightly with a spray bottle to keep the surface moist. Avoid oversaturated soil. Place flats or pots with drainage holes in trays of water for moisture wicking.

Provide Gentle Bottom Heat

Optimal soil temperature for ranunculus seed germination is 60-65°F. Consider placing trays on heat mats or germination mats to maintain warmth.

Give Bright Light

Supplement with grow lights to mimic spring sun. Position lights very close to the seedlings as they emerge.

Transplant Carefully

Gently transplant sprouts to larger pots once the second set of true leaves appear. Handle delicate seedlings carefully by the leaves, not the stems.

Harden Off Before Transplanting Outdoors

Acclimate young plants slowly to outdoor conditions over 7-10 days. Gradually increase outdoor time while protecting from extreme weather shifts. Avoid transplant shock.

With the right sowing time, temperature, moisture and light, you’ll have sturdy ranunculus starters ready to transfer to beds or containers in early spring. Timed properly, your indoor-raised ranunculus will reward you with an abundance of breathtaking blooms.


The soft scent and beauty of flowers like ranunculus are so relaxing, and growing them is great for your mental health. Before spring even comes around, I can’t wait to feed my soul by seeing flowers. Flowers and plants reduce stress, anxiety, and depression and it helps with concentration. Check out my blog post 10 BENEFITS OF GARDENING! | It can change your life.

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I will be honest, they can be a little tricky, but not growing indoors. The reason they are a little hard to grow has more to do with the soil and weather. Believe me, my ranunculus did not do as well last year because it rained nonstop until July. This is super important, you must have well-draining soil or like dahlia tubers, they will rot. Make sure you are using a very high-quality soil mix. You can add perlite or some type of sand mix to improve the drainage of your soil.

The flower looks fragile and soft, but do not overwater them. Keep the soil moist and try to avoid getting water on the leaves and flowers. Before going to bed at night, water the plant around the base in the morning. This will give it time to dry. It’s important for me to keep an eye on my mom, who loves to water her plants a little too much. She is special!.

How I Grow Ranunculus (+ Schedule of Planting Dates)! // Garden Answer

Can Ranunculus grow indoors?

You can start the corms indoors in late winter. They can be planted outside once the threat of a deep freeze has passed. This occurs approximately a month before the last frost. Ranunculus will only grow back as perennials in zones 8-10. In all other zones, they are treated as annuals. Ranunculus asiaticus. Photo courtesy of Flowerbulbs.com.

When should I plant Ranunculus?

For colder winters, you will have to plant corms in the spring. You can start the corms indoors in late winter. They can be planted outside once the threat of a deep freeze has passed. This occurs approximately a month before the last frost. Ranunculus will only grow back as perennials in zones 8-10.

How do you grow Ranunculus in the fall?

Prepare indoor container-grown ranunculus in the fall. Soak the corms for four to six hours before planting them in a pot. Use loam-based compost with 20 percent horticultural grit and a slow-release fertilizer added to help with drainage and plant health.

How do I plant Ranunculus indoors?

Before planting ranunculus indoors, there are several essential pre-planting steps you should follow to ensure the success of your plants. These steps include selecting the right corms for indoor planting, soaking and pre-sprouting the corms, and creating the ideal soil mixture for potted ranunculus. Selecting the Right Corms for Indoor Planting

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