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.
What to expect
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 real block planting, with its longest, latest daysToMaturity on this list at 98 days — plan for a late-season payoff rather than quick color.
Common problems
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.
Where this fits in your garden
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 →
Spacing: 2 per square foot (square-foot-gardening spacing).
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)
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 (summer snapdragon) seeds
Some links on this page go to retailers we may eventually 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)