Growing Angelonia (Summer Snapdragon): A Complete Profile
By Growing Home Greens Team · July 18, 2026
Angelonia (summer snapdragon) is a tender perennial in zones 9b-11, but almost everywhere else it’s grown as a heat-loving annual, and it’s specifically called out by Growing In The Garden as a strong choice for low-desert summer heat. Upright 1- to 2-foot stems carry small spurred spikes of orchid-like blooms in purple, white, or pink.
Seed treatment that varies by source
Start indoors about 7 weeks before your last frost, with transplants going out 2 weeks after. Seed treatment is a bit inconsistent across sources. Most call for a surface sow with light exposure to trigger germination, though some list a shallow 1/8 inch covering, so err toward barely covering it rather than burying it deep. At 2 per square foot, it’s dense enough to use as a solid block planting, with its longest, latest daysToMaturity on this list at 98 days. Plan for a late-season payoff rather than quick color.
Nearly 100 days means patience, not troubleshooting
Slow or absent germination is usually a light and temperature issue. If seed was buried too deep or the soil stayed cool, give it more time or restart under warmer, brighter conditions. Because it takes nearly 100 days to mature, impatience is the biggest practical risk: don’t judge the planting a failure before it’s had the season it needs.
The slowest of this group to reach maturity
Angelonia isn’t linked to specific companions or antagonists in our data. See the full companion guide for angelonia for how it’s tracked. Its upright habit and 2-per-square-foot density make it a straightforward block or border choice in the Garden Designer, best planned early since it’s the slowest of this group to reach maturity.
Companion planting guide for Angelonia (Summer Snapdragon) · Find your planting dates
Typically viable in USDA zones 2-11. Not sure your zone? Look it up by ZIP code.
Method: Start indoors: Start indoors from seed, then transplant outside. Angelonia (Summer Snapdragon) needs a head start most zones can't give it by direct-sowing alone.
See exact start-indoors, direct-sow, and harvest dates for your zone →
How many Angelonia (Summer Snapdragon) plants fit per square foot?
Spacing: 2 per square foot (square-foot-gardening spacing). Mature height: 1-2 ft.
Varieties worth considering
- Serena series: Named a Louisiana Super Plant for 2019 by the LSU AgCenter, one of the few angelonia series that can be grown from seed rather than requiring cuttings, which is why it's the option worth looking for by name at seed racks. (source)
- Angelface series: A Proven Winners line offered in blue, pink and white, propagated from cuttings rather than grown from seed. Since it isn't seed-grown, buy it as a started plant rather than expecting to sow it the way Serena's seed packets work. (source)
- Serenita Raspberry: An LSU AgCenter Louisiana Super Plant, bred from the Serena line to be even more compact at 12-14 inches while keeping Serena's heat performance, with intense pink and lavender flowers. The pick for a low carpet of color at the front of a bed rather than Serena's taller stems. (source)
Cited from the source shown next to each variety. We haven't grown these ourselves yet, so treat this as a research-backed starting point, not a personal endorsement.
Where to buy angelonia seeds
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 genuine consensus of positive, independent reviews. See the sources cited on each item.
See it growing
Search YouTube for "growing angelonia (summer snapdragon)" videos → (a live search, not a hand-picked video; results vary and aren't vetted by us)
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Growing Angelonia (Summer Snapdragon): A tender perennial grown as an annual almost everywhere, bred specifically to keep blooming through brutal summer heat.
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