Illustration
Lemon Star
Thunbergia alata 'Lemon Star'
Lemon Star blooms from June through October.
Months here are Northern Hemisphere months; in the Southern Hemisphere, shift them by six months.
Growing Lemon Star
Plant it in full sun. It prefers moderate water. It is hardy in USDA zones 10–11. Expect it to reach about 8 ft tall and 3.5 ft wide at maturity, in roughly 1 year (not yet checked).
No toxicity note is on file for Lemon Star. That is not a clearance: check its safety for people and pets before planting.
What this means
Written with AI assistance and not yet checked plant by plant against recorded sources, so treat every fact above as a starting point. Its scientific name was checked against botanical registries, an audit keeps its values consistent with the rest of the library, and a July 2026 review re-read the main facts of every plant then in the library against horticultural authorities without recording a source for each, which is why none of that counts as checked here. The source-by-source check is working through the whole library in the open, and a checked plant says so in this row.
When to plant Lemon Star
Lemon Star sits in a nearly frost-free range (zones 10 to 11): plant it in the cool season, fall through late winter, and let the mild months settle its roots. On the calendar that means October or November, or January or February. Once settled, it blooms from June to October.
Month-by-month timing for your zone is on the planting calendar; if you garden near zone 10, the middle of this plant's hardy range, start with zone 10 in January. Derived from the plant's category, zones and bloom months plus typical zone frost dates, not checked separately.
How big does Lemon Star get?
8 fttall5 ft 7 inan adult3.5 ftwideSee Lemon Star in a garden plan: the planner shows it in 3D beside everything else you add, growing toward this size over the years.
How far apart to plant Lemon Star
Derived from the mature spread above by a fixed rule, not checked separately: spacing is the spread, center to center.
Space Lemon Star about 3.5 ft apart, center to center, so each plant has room to reach its full width.
Add Lemon Star to a garden plan and the planner draws it at its full width, so you see the spacing before you buy.
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Design a garden with this
Drop this plant onto a 3D plan, see how it fills in, and watch your whole garden bloom across the year.