Illustration
Katherine Havemeyer
Syringa vulgaris 'Katherine Havemeyer'
Katherine Havemeyer blooms from April through May.
Months here are Northern Hemisphere months; in the Southern Hemisphere, shift them by six months.
Growing Katherine Havemeyer
Plant it in full sun. It prefers moderate water. It is hardy in USDA zones 3–7. Expect it to reach about 10 ft tall and 8 ft wide at maturity, in roughly 4 years (not yet checked).
No toxicity note is on file for Katherine Havemeyer. 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 Katherine Havemeyer
Plant Katherine Havemeyer in early spring as soon as the soil is workable, or in early fall at least six weeks before your first frost, so roots establish in cool weather. In zone 5, the middle of its hardy zones 3 to 7, spring means April to June and fall means August or September. Once settled, it blooms from April to May.
Month-by-month timing for your zone is on the planting calendar; if you garden near zone 5, the middle of this plant's hardy range, start with zone 5 in April. Derived from the plant's category, zones and bloom months plus typical zone frost dates, not checked separately.
How big does Katherine Havemeyer get?
10 fttall5 ft 7 inan adult8 ftwideSee Katherine Havemeyer 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 Katherine Havemeyer
Derived from the mature spread above by a fixed rule, not checked separately: spacing is the spread, center to center.
Give Katherine Havemeyer about 8 ft of clear ground in every direction, measured from its center. It is one plant with room around it, not a row, and a raised bed is too small for it.
Add Katherine Havemeyer 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.