Snapdragon

Basic Information

Seed Number

140

Seed Name

Snapdragon

Variety

Unknown

Category

Flower

Plant Family

Plantaginaceae

Plant Type

Snapdragon (Antirrhinum majus)

Planting Method

Transplant

Seed Status

In Seed Bank

Created

2026-08-14 00:50:34

Updated

2026-08-19 15:35:29

Planting Information

Start Planting Date

Feb 24

Last Recommended Planting Date

May 31

Plantable Months

February, March, April, May

Indoor Start

Feb 24 – Mar 10

Direct Sow

Not Recommended

Transplant

Apr 15 – May 31

Indoor Start Weeks Before Frost

10 weeks

Transplant Weeks After Frost

Not recorded

Germination Days

7–14 days

Harvest/Maturity

Not recorded

Succession Planting

Not recorded

Growing Conditions

Ideal Soil Temperature

70-75°F

Planting Depth

Surface sow; light required

Plant Spacing

4-12 in

Row Spacing

12-18 in

Thin-To Spacing

Not recorded

Sun Requirements

Full sun to partial shade

Water Needs

Keep soil evenly moist but not saturated

Soil Preference

Rich, moist, well-drained soil; neutral pH preferred

Minimum Container Size

Not recorded

Plant Height

Not recorded

Perennial/Biennial Status

Annual

Container Friendly

Yes

Trellis/Support Needed

No

Frost Tolerant

Yes

Heat Tolerant

No

Drought Tolerant

No

Pollinator Friendly

Yes

Medicinal

No

Garden Uses

Companion Planting

Storage

Seed Source/Brand

MSU Extension; Detroit frost dates; Almanac Detroit

Packet Year

Not recorded

Quantity Notes

Not recorded

Purchase Date

Not recorded

Expiration Year

Not recorded

Storage Box

Not recorded

Container

Not recorded

Envelope

Not recorded

Row

Not recorded

Slot

Not recorded

Storage Notes

Not recorded

Notes

Original Planting Method: Start indoors
Outdoor / Direct Sow / Transplant Window: Apr 15 – May 15; Sep 1 – Sep 20
Days to Harvest / Bloom: 90–120 days to bloom
Medicinal / Herbal Use: Ornamental
Perennial?: Short-lived perennial; grown as annual
Succession / Reusable Notes: Very slow from seed; start early.
Zone 6B Notes: Can handle cool weather better than heat.
Companion Plants: Pansies, calendula, herbs, brassicas, early spring flowers
Avoid Planting Near / Watch Outs: Hot dry midsummer beds
Sources: MSU Extension: https://www.canr.msu.edu/resources/garden_planning_calendar | Detroit frost dates: https://www.ufseeds.com/vegetable-planting-calendar-detroit-michigan.html | Almanac Detroit: https://www.almanac.com/gardening/planting-calendar/MI/Detroit

[[RESEARCH ENRICHMENT START]]
Zone 6B: Snapdragons are cool-season flowers and can be transplanted before the final frost after hardening. They often slow or stop flowering during hot summer weather and may resume as temperatures cool.
Germination: Surface sow 8-10 weeks before planting out. Light is required for germination. Bottom-water or mist gently so seed is not buried.
Harvest: For cut flowers, harvest when florets on the lower one-third to one-half of the spike are open.
Seed Saving: Allow flower spikes to mature until seed capsules dry. Because the cultivar is unknown, saved plants may vary substantially.
Special Care: The variety is unknown, so mature height, stem length and whether staking would be useful cannot be determined reliably. Pinching is optional and encourages branching but delays flowering.
Research Source: Johnny's Selected Seeds — https://www.johnnyseeds.com/growers-library/flowers/snapdragon/snapdragon-key-growing-information.html — 7-14 day germination, 70-75°F temperature, 8-10 week indoor start, surface sowing, light requirement, spacing, sun, soil and harvest
[[RESEARCH ENRICHMENT END]]