Anti-Transpirant

They are the same class of product under two names. Both form a flexible film on foliage that slows water loss through transpiration. The term anti-desiccant is more common in winter protection contexts, while anti-transpirant is the broader horticultural term covering transplanting, shipping, and heat-stress use.

Apply in late fall once plants are dormant but before hard freezes, typically when daytime temperatures sit between 40 and 50 degrees Fahrenheit. Foliage must be dry and the film needs several hours above freezing to cure. A second application in mid-winter during a thaw extends protection on broadleaf evergreens.

Broadleaf evergreens such as boxwood, holly, rhododendron, and laurel see the biggest benefit, since they keep transpiring all winter while frozen soil blocks water uptake. Conifers, fall transplants, and dug nursery stock headed for shipping or storage also respond well.

Yes. Spraying foliage before digging or transplanting reduces water loss while damaged roots reestablish, which is why nurseries treat balled-and-burlapped and bare-root stock before shipping. It is one of the most cost-effective ways to improve transplant survival on landscape installs.

Rates vary by use. Winter protection typically calls for a stronger concentration than summer transplant or heat-stress applications. Always follow the label for the specific product and use case, and agitate the tank regularly since film-forming concentrates can separate.

Applied correctly, no. Most films dry clear to slightly glossy. Problems come from spraying in freezing conditions, applying to wet foliage, or over-concentrating the mix, which can cause spotting on sensitive species. When treating a new species at scale, test a small section first.

A winter application typically holds for six to ten weeks depending on weather, since the film gradually weathers and new growth is unprotected. Plan on one late-fall application plus a mid-winter refresh for full-season coverage on exposed broadleaf evergreens.