Gladiolus Planting Guide

June

June gladiolus essentials

Whether you're sowing, transplanting, or harvesting, gladiolus needs the right timing. Check your zone below for exact dates.

Sun full sun

Water moderate

Days to harvest 70–100

Plant depth 5″

Spacing 5″

How to water gladiolus
About an inch of water a week keeps gladiolus happy. Check your weather forecast before watering — skip if rain is coming.
Where to put gladiolus
South-facing beds are ideal for gladiolus. Shade from nearby trees or fences costs real production.
Check your local forecast before planting
Your zone determines the exact week to plant gladiolus. Pick your county below and we'll line everything up against your frost dates.

Pick your county for exact gladiolus timing →

Gladiolus (Gladiolus spp.) produce tall, stately spikes of trumpet-shaped blooms in a rich array of colors, making them one of the most popular cut flowers in the world. Each spike carries 12–20 florets that open in succession from bottom to top over 7–10 days. By planting corms every two weeks from last frost through early summer, gardeners create a continuous succession of fresh blooms from midsummer through fall. Corms multiply each season — a single planting becomes a growing collection over the years. Ideal for back-of- border planting, cutting gardens, and mixed summer containers.

Gladiolus spp. · Flower · Iridaceae family · 70–100 days to maturity

Bulb Blooms in Summer Pollinator-friendly Good for cutting

Why it matters: If you're just starting a flower garden in your area, Gladiolus is a forgiving first pick. It tolerates imperfect soil, mild drought, and the occasional missed watering. The reward: weeks (sometimes months) of continuous color.

Get Your Personalized Gladiolus Planting Dates

Enter your ZIP code to see exact planting dates, soil compatibility, and growing tips specific to your county.

Where Can You Grow Gladiolus?

Zone Compatibility for Gladiolus Zones 3a – 10b

1a 1b 2a 2b 3a 3b 4a 4b 5a 5b 6a 6b 7a 7b 8a 8b 9a 9b 10a 10b 11a 11b 12a 12b 13a 13b

Ideal (data available) Suitable Marginal Not recommended

Planting Dates by Zone

Zone	Start Indoors	Direct Sow	Transplant	Bloom
Zone 3a	—	May 29	May 29	Sep 4 – Oct 16
Zone 3b	—	May 24	May 24	Aug 30 – Oct 18
Zone 4a	—	May 13	May 13	Aug 12 – Oct 14
Zone 4b	—	May 8	May 8	Aug 7 – Oct 16
Zone 5a	—	May 2	May 2	Jul 25 – Oct 17
Zone 5b	—	Apr 25	Apr 25	Jul 18 – Oct 17
Zone 6a	—	Apr 10	Apr 10	Jun 26 – Oct 9
Zone 6b	—	Apr 3	Apr 3	Jun 19 – Oct 9
Zone 7a	—	Mar 25	Mar 25	Jun 3 – Oct 7
Zone 7b	—	Mar 18	Mar 18	May 27 – Oct 14
Zone 8a	—	Mar 8	Mar 8	May 17 – Oct 18
Zone 8b	—	Feb 25	Feb 25	May 6 – Oct 21
Zone 9a	—	Feb 10	Feb 10	Apr 21 – Oct 20
Zone 9b	—	Jan 25	Jan 25	Apr 5 – Oct 18
Zone 10a	—	Jan 1	Jan 1	Mar 12 – Oct 8
Zone 10b	—	Jan 1	Jan 1	Mar 12 – Oct 22

Why are some columns showing "—"?

Start Indoors shows "—" because Gladiolus is typically direct sown outdoors rather than started indoors. It germinates quickly and doesn't transplant well.

How to Plant Gladiolus

Planting Depth

Between Plants

12"

Between Rows

Growing Conditions

☀️ Sun

Full Sun (6-8+ hours)

💧 Water

Moderate — regular watering

Water when the top inch of soil feels dry. Consistent moisture produces the best results.

🧪 Soil pH

6 – 6.5

Prefers neutral to slightly acidic soil — ideal for most garden beds.

🗺️ Hardiness Zones

Zone 3a – 10b

📅 Days to Maturity

70–100 days

Medium-season crop. Start early for best results in shorter seasons.

👪 Plant Family

Iridaceae

Rotate with other families yearly to prevent soil-borne diseases. Don't plant in the same spot where Iridaceae family crops grew last year.

Succession Planting Gladiolus

Gladiolus matures in just 70–100 days, making it ideal for succession planting. In a typical 180-day growing season, you can get up to 2 successive plantings by sowing every 8 weeks.

Your actual succession count depends on your local frost dates. Enter your ZIP code to get personalized succession planting dates for your area.

Companion Planting for Gladiolus

✅ Good Companions

Dahlias Zinnias Marigolds Cosmos Salvia

Check more combinations with our Companion Planting Checker →

Growing Tips for Gladiolus

Plant corms 4–6 inches deep, pointed end up, as soon as soil reaches 60°F after last frost. Space 4–6 inches apart; rows 12 inches apart. Stake or grow through a support grid — tall varieties reach 4–5 feet and tip in wind. Begin succession plantings every 2 weeks through early July for continuous bloom. Water deeply once a week; mulch to conserve moisture and suppress weeds. Cut spikes for vases when the lowest floret just begins to open. After first killing frost (in cold zones), dig corms, let dry for 3–4 weeks in a ventilated spot, remove cormels, and store in mesh bags at 35–50°F. In zones 7b–8a, corms sometimes survive mild winters in ground with heavy mulch; in zones 8b+, in-ground overwintering is reliable.

Saving Gladiolus Seeds

Recommended for Your Garden

🌱

Seed Starting Trays $8-20

Start seeds indoors with reusable cell trays and humidity domes.

🧪

Soil Test Kit $12-25

Test your soil pH, nitrogen, phosphorus, and potassium levels before planting.

🏷️

Garden Plant Markers $6-12

Keep your garden organized with durable, weather-resistant plant labels.

Reader favourite

Seed Saving & Storage Guide

$27 $157 value

Most saved seeds go bad before next season. This shows exactly when to pick, how to dry, and where to store seeds from 200 plants so yours don't.

200 plants, step-by-step: life cycle, pollination type, isolation
Exact temperature + humidity ranges that keep seeds viable
Bonus: searchable Google Sheets tracker + custom GPT assistant

Save a lifetime of seed money →

Gladiolus by State

Frequently Asked Questions

How long does it take to grow Gladiolus?

Gladiolus (Gladiolus spp.) takes 70 to 100 days from planting to harvest. Exact timing depends on your variety, growing conditions, and USDA zone.

What zones can Gladiolus grow in?

Gladiolus can be grown in USDA zones 3a through 10b. Use the planting calendar above to find the exact dates for your zone.

How much sun does Gladiolus need?

Growing Gladiolus requires Full Sun (6-8+ hours), Moderate — regular watering, and soil pH of 6 to 6.5.