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17 Flower Seeds to Sow Midsummer in June & July

Published on July 24, 2021Last updated October 3, 2021 ♛ By Melissa J. Will

This post contains affiliate links.
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There are plenty of fast-growing flowering annuals you can sow in midsummer to enjoy flowers into fall including marigold, calendula, and zinnias. Have a look at the choices, check your days to first frost, and get your seeds ready so you don’t miss out.

There are also lots of edible crops to start now. See 20 Vegetables to Sow Midsummer for Fall for suggestions.

Flowers to sow from seed mid-summer including poppies and cosmos.

Sowing Seeds for Late Summer Blooms

Examples of flowers to sow mid-summer in the garden.

After the flourish of spring planting, many of us take it easy in the summer garden, just tending to some weeding, harvesting some early fruit and vegetable crops, and trellising vining plants.

But there’s a huge reward ahead if you make time to sow seeds in the middle of summer—during June and July.

The seeds I’ve listed here are flowering annuals to enjoy before cool fall and winter weather sets in. I’ve also got a midsummer sowing plan for cool-tolerant vegetables here.

Getting Started

To get started, you will need to know your average first frost date and hardiness zone. I’ve provided links below to lookup this information.

This information is intended for gardeners in zones 4 to 8 (ish) simply because that’s what I’m most familiar with.

What we choose to sow is based on how many days we have before first frost. That number should be greater than the “days to maturity” or “days to bloom” listed on the flower seed packet plus a week or two if possible.

The most important step is to get your seeds asap.

You will sow directly outdoors unless it’s unusually hot or dry. If conditions are extreme, indoor seed starting or a covered patio may be better options.

Find Your Frost Dates & Hardiness Zone

Plant Hardiness Zones | United States flag United States | Canadian flag Canada
These are listed on seed packets and plant tags to guide your choices.

Average Frost Dates | Use this calculator at Almanac.com. Enter your city and state or province to find your first and last frost dates and number of frost-free days.

Ecoregion | Learn about local native plants, animal species, and environmental conditions to make garden choices that benefit your ecosystem.

Learn More: Understanding Frosts & Freezing For Gardeners

Flower Seeds to Sow Midsummer

Once you know how many days you have until first frost, browse your favorite seed sellers to see what fits your timeline.

I’ve provided a chart (below) listing average days to bloom to help refine your options. But, even within the same species there can be wide variations in timing, so, if one variety doesn’t work, another might. Sunflowers are a good example: some dwarf varieties need just a couple of months where the tall varieties with large heads need several months more.

You’ll also notice that some flowering annuals are labelled as hardy or half-hardy. This means they can tolerate some cold around frost time which is great for a longer bloom time.

And, as always, avoid any plants known to be invasive or problematic in your area.

The number of days to germinate listed are based on numbers provided by several seed companies and apply to growing in the recommended conditions including the preferred soil temperature at sowing time. So read your seed packets to give your seeds their best start and allow more time if your conditions are not optimum.

Mail Order Seeds

  • SeedsNow | Botanical Interests United States
  • West Coast Seeds Canada

I’ve linked to Botanical Interests seeds below. You can find more seed sellers here: United States | Canada.


Seed Suggestions

1 Amaranthus

2 Bachelor’s Button

3 Butterfly Flowers

4 Calendula

5 California Poppy

6 Cosmos

7 Flax

8 Marigold

9 Morning Glory

10 Nasturtium

11 Nigella

12 Poppy

13 Phlox

14 Sunflower

15 Sweet Alyssum

16 Sweet Pea

17 Zinnia


Mid-summer garden filled with flowers.

Related: Midsummer Garden Tasks: What To Do Before Fall


1Amaranthus

Amaranth flower
Amaranthus
(Amaranthus spp.)

Amaranthus (Amaranthus spp.)

Full sun

Seeds

Amaranth | Botanical Interests (US shipping)

Seed Sowing Soil Temperature
65-75°F (18-24°C)

Days to Germinate
7-10

Days to Bloom After Sowing
40-105 (6-15 weeks)

2Cornflower

Cornflowers
Cornflowers
(Centaurea cyanus)

Bachelor’s Button / Cornflower (Centaurea cyanus)

Full sun

Seeds

Cornflower | Botanical Interests (US Shipping)

Seed Sowing Soil Temperature
60-70°F (15-21°C)

Tip
Can also sow around last frost for next growing season.

Days to Germinate
7-14

Days to Bloom After Sowing
65-75 (9-10 weeks)

3Butterfly Flowers

Tithonia rotundifolia flower
Butterfly Flowers
(Tithonia rotundifolia)

Butterfly Flowers (Tithonia rotundifolia)

Full sun

Seeds

Butterfly Flower (Mexican Sunflower)| Botanical Interests (US Shipping)

Seed Sowing Soil Temperature
70°F (21°C)

Days to Germinate
7-14

Days to Bloom After Sowing
80 (11 weeks)

4Calendula

Calendula flowers
Calendula
(Calendula officinalis)

Calendula (Calendula officinalis)

Sun or Part Sun, Cold-Tolerant

Seeds

Calendula | Botanical Interests (US Shipping)

Seed Sowing Soil Temperature
70°F (21°C)

Tips
Pinch back to encourage bushier growth.
Look for tall varieties (not dwarf) if you want cut flowers.

Days to Germinate
7-21

Days to Bloom After Sowing
45-56 (6-8 weeks)

5California Poppy

California poppy
California Poppy
(Eschscholzia californica)

California Poppy (Eschscholzia californica)

Sun

Seeds

California Poppy | Botanical Interests (US Shipping)

Seed Sowing Soil Temperature
55°F (12°C)

Tip
Can also sow outdoors after last frost for next growing season.

Days to Germinate
14-21

Days to Bloom After Sowing
60-75 (8-10 weeks)


Mid-summer garden filled with flowers.

Related: Midsummer Garden Tasks: What To Do Before Fall


6Cosmos

Cosmos flowers
Cosmos
(Cosmos bipinnatus and
C. sulfureus)

Cosmos (Cosmos bipinnatus and C. sulfureus)

Sun

Seeds

Cosmos | Botanical Interests (US Shipping)

Seed Sowing Soil Temperature
70-75°F (21-25°C)

Days to Germinate
7-10

Days to Bloom After Sowing
70-84 (10-12 weeks)

7Flax

Flax flowers
Flax
(Linum usitatissimum)

Flax (Linum usitatissimum)

Sun

Seeds

Flax | Botanical Interests (US Shipping)

Seed Sowing Soil Temperature
50-80°F (10-27°C)

Tip
Can also sow after last frost for next growing season.

Days to Germinate
21

Days to Bloom After Sowing
50-60 (7-8 weeks)

8Marigold

Marigold flowers
Marigold
(Tagetes sp.)

Marigold (Tagetes sp.)

Sun

Seeds

Marigold | Botanical Interests (US Shipping)

Seed Sowing Soil Temperature
70-75°F (21-25°C)

Tip
Can also sow indoors in vermiculite 6-8 weeks before last frost or directly outdoors around last frost for next growing season.

Days to Germinate
4-12

Days to Bloom After Sowing
42-70 (6-10 weeks)

9Morning Glory

Morning glory flowers
Morning Glory
(Ipomoea purpurea)

Morning Glory (Ipomoea purpurea)

Sun

Seeds

Morning glory | Botanical Interests (US Shipping)
Avoid Bindweed (Convolvulus arvensis) also known
as “morning glory” which is highly invasive.

Seed Sowing Soil Temperature
70-85°F (21-30°C)

Tip
Outdoor seed starting may be slower than indoor.

Days to Germinate
10

Days to Bloom After Sowing
100 (14 weeks)

10Nasturtium

Nasturtium flowers
Nasturtium
(Tropaeolum majus)

Nasturtium (Tropaeolum majus)

Sun, Cold-Tolerant

Seeds

Nasturtium | Botanical Interests (US Shipping)

Seed Sowing Soil Temperature
55-65°F (12-18°C)

Tip
Sow indoors or directly outdoors.
Part-shade makes a leafier, sprawling plant.

Days to Germinate
7-10

Days to Bloom After Sowing
60 (8 weeks)

11Nigella

Nigella flowers
Nigella
(Nigella damascene)

Nigella (Nigella damascene)

Sun

Seeds

Nigella | Botanical Interests (US Shipping)

Seed Sowing Soil Temperature
65-70°F (18-21°C)

Days to Germinate
10-15

Days to Bloom After Sowing
65-75 (9-11 weeks)

12Poppy

Poppy flowers
Poppy
(Papaver spp.)

Poppy (Papaver spp.)

Sun

Seeds

Poppy | Botanical Interests (US Shipping)

Seed Sowing Soil Temperature
Perennial 68-70°F(20-21°C)

Annual 60°F(16°C)

Days to Germinate
14-28

Days to Bloom After Sowing
55 (8 weeks)

13Phlox

Phlox flowers
Phlox
(Phlox drummondii)

Phlox (Phlox drummondii)

Sun, Cold-Tolerant

Seeds

Phlox | Botanical Interests (US Shipping)

Seed Sowing Soil Temperature
60°-65°F (16°-18°C)

Tip
Can also direct sow when ground is workable in spring.

Days to Germinate
5-10

Days to Bloom After Sowing
50-65 (7-9 weeks)

14Sunflower

Sunflower
Sunflower
(Helianthus annuus)

Sunflower (Helianthus annuus)

Sun

Seeds

Sunflower | Botanical Interests (US Shipping)
Look for dwarf varieties.

Get my best tips for growing sunflowers here.

Seed Sowing Soil Temperature
70-75°F (21-25°C)

Days to Germinate
14

Days to Bloom After Sowing
75-100 (10-14 weeks) Check for your variety.

15Sweet Alyssum

Sweet alyssum flowers
Sweet Alyssum
(Lobularia maritima)

Sweet Alyssum (Lobularia maritima)

Sun or Part Sun, Cold-tolerant

Seeds

Sweet Alyssum | Botanical Interests (US Shipping)
Look for dwarf varieties.

Seed Sowing Soil Temperature
55-70°F (13-21°C)

Tip
Seeds require light to germinate: sow on soil surface.
Dwarf varieties spread as ground cover and reseed.

Days to Germinate
8-10

Days to Bloom After Sowing
50-60 (7-8 weeks)

16Sweet Pea

Sweet pea flowers
Sweet Pea
(Lathyrus odoratus)

Sweet Pea (Lathyrus odoratus)

Sun

Seeds

Sweet Pea | Botanical Interests (US Shipping)
Be sure they are annuals. The perennial (L. latifolius) is invasive.

Seed Sowing Soil Temperature
55-65°F (12-18°C)

Tips
Soak seeds in moist paper towel for 1 day prior to sowing.
Best sweet pea growing tips
How to save sweet pea seeds

Days to Germinate
28

Days to Bloom After Sowing
50-60 (7-9 weeks)

17Zinnia

Zinnia flowers
Zinnia
(Zinnia elegans)

Zinnia (Zinnia elegans)

Sun

Seeds

| Botanical Interests (US Shipping)

Seed Starting Soil Temperature
70-80°F (21-26°C)

Tips
Can also sow directly outdoors after last frost.
Pinch stems for more flowers.
Save zinnia seeds for next year.

Days to Germinate
5-24 days

Days to Bloom After Sowing
50-60 days (7-8 weeks)


Resources

  • Midsummer Garden Tasks: What To Do Before Fall
  • 20 Vegetables to Sow Midsummer for Fall (Seed Sowing Plan)

Plant Life Cycles

Annuals complete their life cycle (germination, flowering, setting seed) in one growing season and do not grow back. The term is used both for plants that have a short life cycle and do not tolerate freezing temperatures. Petunias and zinnias are common annuals.

Perennials have a multi-year life cycle and, if suited to our hardiness zone, will go dormant in the winter and resume growth in spring—year after year.

  • The above-ground growth of perennial flowers like coneflowers (Echinacea spp.) typically dies off in fall with new growth appearing from the roots in spring.
  • Woody perennial shrubs and vines drop leaves from their hardwood in fall and grow new leaves, shoots, and flowers in spring or summer. Examples include sand cherry (Prunus pumila) and honeysuckle (Lonicera spp.).

Biennials take two years to complete their life cycle (from germination to seed production). Biennial vegetables like carrots can be harvested in year one for food or left over winter for a second year if flowering and seed production is desired.

Time to get your seeds and start sowing.

~Melissa the Empress of Dirt ♛

17 Flower Seeds to Sow Midsummer in June & July
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Melissa J. Will - Empress of DirtWelcome!
I’m Melissa J. Will a.k.a. the Empress of Dirt (Ontario, Canada).
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