Horticultural Soap - 4 Ounce
Horticultural Soap - 4 Ounce
Horticultural Soap - 4 Ounce
Horticultural Soap - 4 Ounce

Horticultural Soap - 4 Ounce

Regular price $9.99 Sale

Our organic horticultural soap is the perfect size to treat a few dozen plants for an entire season, without any waste. This 4-ounce bottle makes 8 quarts of spray. Looking for a different size? Our horticultural soap is also available in 1-ounce and 2-ounce bottles.

Insecticidal or horticultural soap is effective in controlling spider mites and other soft-bodied insects such as aphids, scales, whiteflies, and mealybugs. An advantage of horticultural soap is that it works on contact. There is no residual effect. Only insects coated with the spray are affected. It is considered selective because it has minimal adverse effect on beneficial insects, such as honeybees, lacewings, and ladybugs. 

There is minimal potential for plant injury (phytotoxicity) when applied during cooler hours of the day and when the plant is not in full sun.

Some plants are sensitive to soap sprays and may be seriously injured by them, so it's best not to apply it to these plants:

  • Portulaca (Portulaca grandiflora) 
  • Some tomato varities (Solanum lycopersicum) 
  • Conifers under drought conditions 
  • Plants with a bluish color caused by a waxy leaf coat. 
  • Hawthorn (Crataegus spp.) 
  • Sweet pea (Lathyrus odoratus) 
  • Cherries (Prunus spp.) 
  • Plum (Prunus spp.) 
  • Horse Chestnut (Aesculus hippocastanum) 
  • Mountain Ash (Sorbus spp.) 
  • Japanese Maple (Acer palmatum) 
  • Bleeding Heart (Lamprocapnos spectabilis) 
  • Maidenhair Fern (Adiantum spp.) 
  • Crown of Thorns (Euphorbia milii) 
  • Lantana (Lantana camara) 
  • Nasturtiums (Tropaeolum spp.) 
  • Gardenias (Gardenia jasminoides) 
  • Easter lilies (Lilium longiflorum). 

Somewhat sensitive plants include

  • Azaleas (Rhododendron spp.) 
  • Begonias (Begonia spp.) 
  • Fuchsias (Fuchsia spp.) 
  • Geraniums (Pelargonium spp.) 
  • Impatiens (Impatiens spp.).