Leyland cypress

x Cuprocyparis leylandii

Family: Cupressaceae

Pet & Human Safety

People: Skin irritant to peoplePets: Not on the ASPCA lists as we read them

Hazardous parts

Not yet checked.

Preparation

n/a

Hazard type

skin allergen (RHS)

Hazard route

RHS "Potentially harmful" note: skin allergen; wear gloves and other protective equipment when handling. RHS names no toxin and gives no severity.

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.

No ASPCA page was found. The RHS notes it can cause skin reactions in dogs.

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.

Get the app: coming soon

Care

Hardiness zones: Not checked yet
Light: RHS: full sun or part shade
Mature size: US: RHS: max height over 40 ft (more than 12 m; over 100 ft if unchecked) and max spread 13-26 ft (4-8 m)

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.

Get the app: coming soon