Masterwort

Astrantia major

Pet & Human Safety

People: No hazard foundPets: Not on the ASPCA lists as we read them

Hazardous parts

Not yet checked.

Preparation

Not applicable; this is an ornamental plant.

Hazard type

Not yet checked.

Hazard route

none named by our sources

How complete this information is

The safety information on this page is partial. Where a source covers a point, it is shown; where none does, the page says so.

Toxic to pets

No ASPCA entry found.

Neither ASPCA nor NC State lists a pet-safety verdict for this plant. Not listed means no verdict was found, not that it's safe. Keep pets from eating it and call a vet or the ASPCA Poison Control line if a pet seems unwell.

PlotAndPetal cannot tell you whether a plant you found can be eaten. Only someone who can see the plant can identify it.

Poison control

If someone has collapsed, cannot be woken, is having a seizure or has trouble breathing, call 911 now. For any other possible poisoning, call Poison Help: 1-800-222-1222.

Emergency number source: U.S. federal law (47 U.S.C. § 251(e)(3)), read 2026-10-07.

Naturalist Lore

Historical Background & Breeding Lore

The history of this plant and its name, and how it was bred, where we have them.

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Care

Hardiness zones: USDA zones 4a to 7b (Wisconsin Horticulture Extension); Arkansas Extension says hardy in zones 4 through 7 but likely to suffer where summer nights are hot
Light: Wisconsin Extension says it grows best in part shade, with a few hours of morning sun and dappled shade the rest of the day; in full shade it blooms less.
Water needs: high
Mature size: Mounded clumps up to 1.5 feet high (Wisconsin Extension). Arkansas Extension says 2 to 3 feet tall in flower and about half that in leaf.

Soil & Drainage

Pruning & Flush Rhythm

Feeding Schedule

How to prepare the soil, when and what to feed, and how and when to prune where that applies.

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