Illustration
Grand Marshall
Monarda didyma 'Grand Marshall'
Grand Marshall blooms from July through August.
Months here are Northern Hemisphere months; in the Southern Hemisphere, shift them by six months.
Growing Grand Marshall
Plant it in full sun. It prefers moderate water. It is hardy in USDA zones 3–8. Expect it to reach about 20 in tall and 24 in wide at maturity, in roughly 2 years (a house reading).
No toxicity note is on file for Grand Marshall. That is not a clearance: check its safety for people and pets before planting.
What was checked
Fifteen fields were checked against named botanical sources, each recorded beside the sources that carried it, with every unsettled point written down and decided: mature height and spread, hardiness zones, sun, water, bloom months and color, the trait tags, soil, diseases, pests, toxicity, the plant's own names, and years to mature size, which rests on a recorded house rule where no publisher states one and is marked so. Each fact above carries its own mark. The planting, spacing and size sections are derived from these checked facts by a fixed rule, not checked separately, and the plant type is the library's own classification.
When to plant Grand Marshall
Plant Grand Marshall 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 8, spring means April to June and fall means August or September. Once settled, it blooms from July to August.
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 Grand Marshall get?
20 intall5 ft 7 inan adult24 inwideSee Grand Marshall 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 Grand Marshall
Derived from the mature spread above by a fixed rule, not checked separately: spacing is the spread, center to center.
Space Grand Marshall about 24 in apart, center to center, so each plant has room to reach its full width.
Add Grand Marshall to a garden plan and the planner draws it at its full width, so you see the spacing before you buy.
Where these facts come from
Grand Marshall's height, spread, hardiness zones, sun, water, bloom months and color, trait tags, soil, diseases, pests and toxicity were checked against 16 published sources on September 17, 2026. Each one is linked below with every fact it carried, which can include a fact this page still marks as not yet checked, because a source carrying a value is not the same as the value being held to the standard. Facts not in that list, and the planting, spacing and size sections, are not covered by these sources.
- Perennial Resource (Walters Gardens)height, spread, hardiness zones, sun, water, bloom months and color, trait tags, soil, diseases and pests
- Chicago Botanic GardenPlant Finderheight, spread, hardiness zones, sun, water, bloom months and color, trait tags, diseases and pests
- Perennials.com (Heritage Perennials)Heritage Perennials (perennials.com, Valleybrook Gardens)height, spread, hardiness zones, sun, water, bloom months and color, soil and diseases
- fieldstonegardens.comFieldstone Gardens, Vassalboro, Maineheight, spread, hardiness zones, sun, water, bloom months and color and soil
- hort.netU.S. Plant Patent PP19582, 'Monarda plant named 'Achall'', full text r...height, spread, hardiness zones, bloom months and color, trait tags, diseases and pests
- jeffriesnurseries.comJeffries Nurseries, Portage la Prairie, Manitobaheight, spread, hardiness zones, sun, bloom months and color, trait tags and diseases
- nvknurseries.comNVK Nurseries, Waterdown, Ontarioheight, spread, water, bloom months and color, trait tags, soil and pests
- stonehousenursery.comStonehouse Nursery, Coloradoheight, spread, hardiness zones, sun, water, bloom months and color and soil
- sandysplants.comSandy's Plants, Mechanicsville, Virginiaheight, spread, hardiness zones, water, bloom months and color and diseases
- Mt. Cuba Centertrial, Monarda (Bee Balm) for the Mid-Atlantic Region, Hockessin, Dela...height, spread, bloom months and color and diseases
- NC State ExtensionPlant Toolboxsun, soil, diseases, pests and toxicity
- diggingdog.comDigging Dog Nursery, Albion, Californiaheight, spread and bloom months and color
- Missouri Botanical GardenPlant Findersoil, diseases, pests and toxicity
- usperennials.comUS Perennials, Bloomington, Indiana (zone 6)height, hardiness zones and bloom months and color
- kiefernursery.comKiefer Nursery, Illinoisheight, spread and hardiness zones
- northshoreplantclub.comNorth Shore Plant Club, Winnetka, Illinoisheight, hardiness zones and pests
How the checking works, and what each standard covers, is on the verified plants page.
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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.