13 Flower Seeds to Sow in April for Nonstop Color All Summer Long

The soil is warming up and the risk of frost is beginning to ease, so it makes sense that April is when the gardening year really begins in earnest. What better time, then, to start sowing flower seeds that will carry your garden through the months ahead?

Now, a caveat: timing isn’t one-size-fits-all, and what you can plant now depends on your USDA planting zone, with gardeners in warmer regions able to sow earlier, while those in cooler climates may need to wait a few extra weeks – or start seeds under cover. The key is to work with your local conditions rather than against them.

The good news? There are plenty of easy, fast-growing flowers you can sow in April that will reward you with bold, long-lasting color all summer long. Flick your eyes downwards, dear reader...

13 Flower Seeds to Sow in April

Yes, from heat-loving annuals that thrive in full sun to reliable perennials that return year after year, a little effort now goes a long way.

Whether you’re filling borders, brightening containers, or simply looking to add more pollinator-friendly planting to your space (always a must, in this writer's book!), these flower seeds are some of the best to sow in April for a vibrant, flower-filled summer garden.

1. Zinnias

For instant color and a long flowering season, zinnias are hard to beat. These sun-loving annuals germinate quickly in warm soil, making April sowing ideal in USDA Zones 7-10, or slightly later in cooler climates.

Plant something like Burpee Cut and Come Again Mixed Color Zinnia Seeds, then, and expect a rainbow of blooms within weeks. Plus, the more you cut them, the more they flower.

2. Marigolds

Marigolds are one of the easiest flowers you can grow from seed, making them perfect for even the greenest beginners. Sow them outdoors in April in USDA Zones 6-10, or a little later in cooler regions once frost risk has passed, and they’ll quickly produce bold orange and yellow blooms that last all summer.

We like The Old Farmer's Almanac Petite Mixture Marigold Seeds, as they promise flowers aplenty. Get sowing!

3. Globe Amaranth

If you want flowers that thrive in heat and keep their color for months, globe amaranth is a must-sow in April – especially in USDA Zones 7–10, where soil warms quickly. These clover-like blooms come in jewel tones of magenta, purple, and white, and they are tenacious! Honestly, they just keep going through the hottest part of summer.

Drought-tolerant and pollinator-friendly, they’re also excellent for cutting and drying, making these Purple Globe Amaranth Seeds from Amazon a low-effort, high-impact addition to any sunny garden.

4. Sunflowers

Nothing says summer quite like sunflowers, does it? Happily, April is the perfect time to sow them directly into the ground in most USDA Zones 5-9, so long as it's after the last frost.

Fast-growing and unfussy, they’ll reward you with towering stems and cheerful blooms in shades of yellow, orange, and even deep red. For a longer display, sow seeds every couple of weeks through late spring... and be sure to peruse all the wonderful varieties on offer.

5. Coneflowers

Coneflowers (or echinacea, if you prefer) are a staple of prairie-style planting, with bold blooms that pollinators love. April is a good time to sow them in USDA Zones 4-8, though they may take longer to flower in their first year – especially in cooler climates.

Once established, they’re tough, drought-resistant perennials that return year after year. Which absolutely makes a pack of Back to The Roots 100% Echinacea 'Purple Coneflower Seeds well worth $2.98, quite frankly.

6. Yarrow

Yarrow is a classic, low-maintenance perennial with feathery foliage and flat clusters of blooms in shades of white, yellow, pink, and red. It’s particularly well suited to April sowing in cooler USDA Zones (3-6), where seeds can be sown as soon as the soil is workable.

For best results, press Red Yarrow Seeds lightly onto the soil surface rather than covering them, as they need light to germinate. They can take a couple of weeks to sprout, but, once settled, yarrow is drought-tolerant, pollinator-friendly, and may even self-seed in the right conditions.

7. Columbine

Columbine offers delicate, nodding blooms in unique, bicolor combinations that add a cottage garden feel. April sowing can work in cooler USDA Zones (3-6), where seeds may still benefit from natural temperature fluctuations. In warmer regions, or if you want blooms sooner, it’s often easier to plant nursery-grown starts instead; something like this Earlybird™ Purple Blue Columbine from Nature Hills is ideal.

8. Coreopsis

Coreopsis is a one of those cut-and-come-again blooms we can't get enough of, producing masses of daisy-like flowers in sunny yellows and warm tones. Sow seeds in April in USDA Zones 5-9, or after your last frost date in cooler areas.

It thrives in poor soil and dry conditions, making it a great choice for low-maintenance gardens with long-lasting color. Plant UpTick Gold & Bronze Coreopsis seeds from Burpee, then, and enjoy.

9. Cockscomb

Want something a little different? Cockscomb stands out with its unusual, velvety blooms that resemble coral or brain-like folds or, y'know, the crest of a cockerel (hence the name).

It thrives in heat, so April sowing works best in USDA Zones 7-10, or later in cooler regions once temperatures are consistently warm. Plant Burpee's Red Velvet Cake Celosia, then, and expect dramatic texture and rich color through the height of summer.

10. Spider Flower

Don't be put of by the name; spider flowers (aka cleome) produce tall, airy spikes of pink, purple, or white flowers that add height and movement to borders. if you sow in April in USDA Zones 7-10 – or after the last frost in cooler climates.

It’s easy to grow but can self-seed freely, particularly in warmer regions, so deadhead if you want to keep it contained. We love the Sparkler 2.0 Mixed Colors Cleome Seeds from Burpee for plenty of otherworldly blooms.

11. Petunias

Petunias are known for their long-lasting, trumpet-shaped blooms, but they’re typically started indoors 8–10 weeks before the last frost. If you’re gardening in cooler USDA Zones (3-6), you can still sow something like Burpee's Crazytunia Mayan Sunset Petunia Plants in early April indoors, though buying young plants will give you faster results;.

Whichever path you choose to follow, they’ll provide continuous colour in containers and hanging baskets all summer.

12. Sweet Peas

Sweet peas are universally beloved for their delicate blooms and incredible fragrance, but timing really depends on your climate. In cooler USDA Zones (3-6), you can still sow them in early April for summer flowers.; in warmer zones, though, they’re usually planted earlier, as they prefer cooler growing conditions.

Give something like The Old Farmer's Almanac Sweet Pea Seeds (Knee High Mix) a go, and get yourself hyped for armfuls of scented blooms.

Nasturtiums

Nasturtiums are every bit as useful as they are beautiful, with bright, edible flowers in shades of red, orange, and yellow. Sow them directly outdoors in April in USDA Zones 5-9, or after the last frost in cooler areas.

Remember, they thrive on neglect and poorer soils, making them perfect for beginner gardeners or informal planting schemes. Something like Burpee's Supernova Mixed Colors Nasturtium Seeds is ideal for those who want an explosion of bold sunset tones (with a tasty, peppery flavor).

Look, we all want a vibrant summer garden, but that doesn't happen by chance – it starts with what you plant right now.

Sow these flower seeds in April, and you’ll be rewarded with months of color, from the first warm days right through to early fall. Plus, y'know, you can feel happily smug knowing all of that beauty is down to your own hard work.

We can't think of anything better!