13 Best Flower Seeds to Start Indoors

As winter’s chill loosens its grip, these flower seeds to start indoors can set your garden for a vibrant Spring palette!

Kickstarting your flower seeds indoors offers a strategic advantage for the upcoming growing season. If you’re mapping out your garden plans, we’ve curated a list of top flower seeds to start indoors, setting the stage for a lush, vibrant display when the new season blooms. Keep in mind that flowers thrive under ample sunlight, so remember to transition them outdoors once they sprout a few true leaves.

Best Flower Seeds to Start Indoors

1. Petunia

Best flower seeds to start indoors

Coming in a delightful palette, Petunias require some patience to grow from seeds, and staring them indoors lets you provide the controlled environment they need. Sow a few seeds in each cell of small pots or trays, lightly covering them with soil.

Ensure the soil remains moist and the area is well-lit; within 10-20 days, you should see the first signs of sprouting.

2. Impatiens

Best flower seeds to start indoors

Perfect for shady spots, impatiens need a gentle start, making them great for indoor sowing. Use peat pots and a fine layer of soil to ensure these delicate seeds have the perfect conditions to germinate. Also, maintain a damp but not wet soil environment with bright, indirect light.

3. Pansy

Start your pansies indoors to enjoy their vibrant colors during the cooler seasons of early spring and fall. Plant the seeds in a cool, moist medium, maintaining a temperature around 65°F or 18°C. Opt for bottom watering to prevent leaf diseases in young plants.

Germination takes about 2-3 weeks.

4. Snapdragon

flower seeds to start indoors

Snapdragons prefer cooler temperatures and are, hence, ideal for indoor germination. Simply spread the seeds on top of the soil and press lightly—they need light to germinate and should not be buried.

Place them in a cool area under bright lights, watching for sprouts in 10 to 21 days.

5. Marigold

These cheerful flowers are perfect for beginners because they thrive even under tough conditions. However, starting them indoors is a good idea to ensure they’re strong enough to face any negligence later.

Sprinkle the seeds on the starting mix and keep the soil somewhat moist until saplings emerge in about 1-2 weeks. Provide the newly sprouted plants with 4-5 hours of sunlight to promote growth.

6. Sunflower

Sunflowers seeds to start indoors

Protect young sunflower seedlings from birds and insects by starting them inside. They’re quick to germinate, usually within 7 to 14 days. Plant seeds in individual pots to avoid root disturbance, water them regularly, and place them where they can get full sun.

7. Zinnia

Seeds to start indoors

Start zinnias in peat pots to protect them from late spring frosts. They germinate quickly, often in 5 to 7 days. Keep the soil moist and provide ample sunlight to encourage strong seedling growth ready for transplanting.

8. Violet

Seeds to start indoors

Violas thrive when started early indoors due to their frost tolerance. Place seeds in flats with a seed-starting formula and provide fluorescent lighting to prevent weak growth. Water regularly to maintain ideal soil moisture without letting it get soggy.

9. Cosmos

Seeds to start indoors

Cosmos are effortless to grow, and starting them inside gives you control over their initial conditions. They germinate pretty quickly, within a week or two. Just use a lightweight soil mix and cover the seeds lightly.

A stable temperature and good lighting will ensure these seedlings grow up strong and ready for your garden.

10. Lobelia

Lobelia Best flower seeds

These tiny seeds benefit greatly from a controlled start indoors, typically germinating within 14 to 21 days. Sprinkle them on the surface of a moist seed-starting mix, keeping the medium consistently moist. Provide bright light to prevent the seedlings from becoming spindly.

11. Begonia

Best flower seeds

Begonias, with their lush leaves and beautiful flowers, are ideal for both garden beds and containers. Because they take a bit longer to bloom, starting them indoors about 12 to 16 weeks before the last frost gives them a much-needed head start.

Plant the tiny seeds on a moist, well-drained soil mix and cover with plastic to keep humidity high. Expect germination in about 14 to 21 days and keep the soil from drying out.

12. Salvia

Best flower seeds

Salvia stands out with its spiky blooms that attract pollinators throughout the summer. Start these seeds indoors 6 to 8 weeks before the last frost to see germination in about 14 to 21 days.

Cover them lightly with soil and provide warm conditions, possibly using a heat mat. Also, keep them under a strong light source to promote robust growth.

13. Geraniums

Geraniums are pretty easy to germinate and take about 7 to 14 days to sprout indoors. Use a light, well-draining mix, cover seeds minimally with soil, and keep the environment warm and moist, providing direct light after sprouting to encourage growth.

In case you are into houseplants, here‘s a list you must propagate in April!

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