Illustration
Crystal Palace
Lobelia erinus 'Crystal Palace'
Crystal Palace blooms from May through September.
Months here are Northern Hemisphere months; in the Southern Hemisphere, shift them by six months.
Growing Crystal Palace
Plant it in part sun. It prefers moderate water. Expect it to reach about 6 in tall and 8 in wide at maturity, in roughly 1 year (not yet checked).
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 Crystal Palace
Wait until all danger of frost has passed, then plant out Crystal Palace into warm soil; in most zones that means late spring. Planted then, it flowers from May to September.
Month-by-month timing for your zone is on the planting calendar. Derived from the plant's category, zones and bloom months plus typical zone frost dates, not checked separately.
How big does Crystal Palace get?
6 intall5 ft 7 inan adult8 inwideSee Crystal Palace 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 Crystal Palace
Derived from the mature spread above by a fixed rule, not checked separately: spacing is the spread, center to center.
Space Crystal Palace about 8 in apart, center to center, so each plant has room to reach its full width.
Add Crystal Palace to a garden plan and the planner draws it at its full width, so you see the spacing before you buy.
Good to know about Crystal Palace
Curated from university extensions, botanic gardens and other primary sources, with the source named on every note.
Safety
Toxic to dogs, cats and horses, and to people if eaten in quantity. All parts hold lobeline, a nicotine-like alkaloid; keep pets and children from grazing it. per ASPCA and NC State
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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.