Dormant Oil and Lime Sulphur are best applied to fruit trees, roses, ornamental shrubs like Highbush Cranberry and European Snowball, evergreens such as Cedars, Green Junipers, and Euonymus, and trees like Hawthorn, Crab Apple, and Honey Locust.

Do not use a dormant spray on Beech, Butternut, Colorado Blue Spruce, Hickory, Holly, Sugar Maple, Japanese Maple, or Walnut.


  • This combination spray can only be applied when plants are completely dormant.
  • Applying at the incorrect time can burn leaf buds that have started to swell or show any sign of green.
  • Choose a day from February through March when the temperature will remain at 4C or above, early enough in the day to dry on the plants before the temperature drops. Be aware of environmental conditions that might make the application less effective, such as rain or snow.
  • Distribution of the spray will be more efficient on a day without wind. Higher wind speeds will result in little of the mixture adhering to the plant.
  • Dormant Spray will coat and dry most effectively when no rain, snow, or sleet is in the forecast.
  • If you have children or pets, it is recommended not to let them enter the treated area for at least 12 hours.


  • Mix Lime Sulphur and Horticulture Oil (available together as a Dormant Spray Kit) according to the package directions.  120 (8TBSP) Lime Sulphur to 60 ml (4TBSP) Horticultural Oil in 3 Litres of Water
  • The easiest method of application is to use a specific Dormant Spray Applicator that attaches to your garden hose.
  • You can also mix the spray according to the box instructions in a 1- or 2-gallon tank sprayer.
  • For small jobs, use a handheld mister bottle or pump sprayer.
  • In all cases, spray the plant starting at the top until it just starts to drip off the branches. If you start spraying from the bottom, you will run out of product before the job’s done.
  • For roses, be sure to spray the soil around the base of the plant as well to control Powdery Mildew and Black Spot.


  • Mix only what you can use. You cannot save the prepared solution for later use.
  • For spraying any garden pesticide, wear protective clothing, long sleeves, a hat, chemical-resistant gloves (not your kitchen rubber gloves), and anti-splash goggles.
  • Wash hands and face after use.
  • Do not let any of the mixture fall or drift onto such hard surfaces as interlock, natural stone, brick, concrete, stucco, wood, or aluminum siding as it may leave a permanent stain. If necessary, tape a large piece of plastic to the area first, and then spray.

For plants that require more attention, an application in November (once dormant) under the same conditions listed above can provide extra protection against pests.