Growing Snapdragons: A Complete Profile
By Growing Home Greens Team · July 18, 2026
Snapdragons are one of the few flowers here that tolerate a light frost, which makes their planting window a little more forgiving than most, though the long indoor lead time before that still catches people off guard. What you’re waiting for is a 1- to 3-foot spike of two-lipped, dragon-mouth blooms in almost any color you’d want.
Surface-sown seed and a long indoor lead time
Start snapdragon seed indoors about 9 weeks before last frost, surface-sown and barely covered since it needs light to germinate. Transplants can go out about a week before last frost given their frost tolerance. It matures in around 90 days, one of the slower flowers on this list, and packs in at 2 per square foot. Taller varieties can reach 3 feet and will shade out shorter neighbors if planted too close, so factor height into placement the same way you would with any tall vegetable.
Rust shows up late, even on resistant varieties
Rust (orange-brown pustules on the undersides of leaves) is the most common serious snapdragon problem, and it tends to show up later in the season even on varieties with decent resistance. Good spacing and avoiding overhead watering late in the day both help slow it down. Weak, floppy stems on taller varieties are usually a light or crowding issue rather than a disease.
The longest-season flower on this list
Growing snapdragons beside vegetables has no documented benefit for them. In the Garden Designer, place taller varieties where their height won’t shade shorter crops, and budget the full 90-day season since it occupies the bed longer than most flowers on this list.
Companion planting guide for Snapdragon · Find your planting dates
Typically viable in USDA zones 2-10. Not sure your zone? Look it up by ZIP code.
Mature height: 1-3 ft
Method: Start indoors: Start indoors from seed, then transplant outside. It needs a head start most zones can't give it by direct-sowing alone.
When to plant snapdragon, by zone
Every zone snapdragon grows in. Pick your zone in the header and it will be highlighted here. Each zone links to its full page.
| Zone | Start indoors | Sow or plant out | Bloom |
|---|---|---|---|
| 2a & 2b | Mar 18–Mar 25 | May 13–May 20 | Aug 11–Aug 18 |
| 3a & 3b | Mar 28–Apr 4 | May 23–May 30 | Aug 21–Aug 28 |
| 4a & 4b | Mar 13–Mar 20 | May 8–May 15 | Aug 6–Aug 13 |
| 5a & 5b | Mar 8–Mar 15 | May 3–May 10 | Aug 1–Aug 8 |
| 6a & 6b | Feb 21–Feb 28 | Apr 18–Apr 25 | Jul 17–Jul 24 |
| 7a & 7b | Feb 6–Feb 13 | Apr 3–Apr 10 | Jul 2–Jul 9 |
| 8a & 8b | Jan 21–Jan 28 | Mar 18–Mar 25 | Jun 16–Jun 23 |
| 9a & 9bFall window | Aug–Dec | Oct–Feb | ~90 days after transplanting |
| 10a & 10bFall window | Jul–Dec | Sep–Feb | ~90 days after transplanting |
Bloom dates are about 90 days after the sow or plant-out date, not after starting seeds indoors.
Zone 2 sows before zone 3 here, which looks wrong and is not. USDA zones rank winter cold, not season length, and zone 2 is mostly interior Alaska, where hard winters come with warm summers. More on what a zone measures.
See exact start-indoors, direct-sow, and harvest dates for your zone →
How many Snapdragon plants fit per square foot?
Spacing: 2 per square foot (square-foot-gardening spacing). Mature height: 1-3 ft.
Varieties worth considering
- 'Chantilly' series: NC State Extension cut-flower trials found Chantilly productive with strong regrowth and popular with buyers for bouquet work, but also noted it grew susceptible to rust late in the cropping cycle, a tradeoff worth knowing rather than an unqualified recommendation. (source)
- 'Potomac Cherry Rose': NC State's cut-flower trial recorded 22.9 inch stems and an 11.3-day average vase life, but also flagged a real weakness: flowers in a hoophouse "mostly fried" in summer heat, with better results outdoors. Grow it outside, not under cover, in a hot climate. (source)
- Rocket series: Johnny's lists this as the standard for field-cut snaps, 24-36 inches tall with a wide color range, tolerant of light frost and flowering well under long days. The default choice for straightforward cut-flower production rather than the more particular Chantilly or Potomac lines. (source) Buy seeds: True Leaf Market
Why each variety is listed comes from the source shown next to it. We haven't grown these ourselves yet, so treat this as a research-backed starting point, not a personal endorsement. The buy links are separate from those sources: they go to seed suppliers that sell that exact variety, and we may earn a commission on some of them.
Where to buy snapdragon seeds
Botanical Interests · True Leaf Market · Burpee · High Mowing Organic Seeds (each supplier's snapdragon seeds)
The varieties we recommend above each have their own buy links, for the suppliers that sell that exact variety.
As an Amazon Associate we earn from qualifying purchases. Some links on this page also go to other retailers we may earn a commission from as an affiliate, at no extra cost to you. We only recommend products with a clear consensus of positive, independent reviews, or ones we bought and use ourselves. Each item on our gear page says which.
See it growing
Search YouTube for "growing snapdragon" videos → (a live search, not a hand-picked video; results vary and aren't vetted by us)
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Growing Snapdragon: A frost-tolerant cutting flower that needs a long indoor head start and a spot where its height won't shade shorter crops.
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