FAQ: Sprinkler System for Fertilizer

Granular Vs. Water-Soluble Fertilizer

• Fertilizer comes in slow-release granular and water-soluble varieties, with a range of different mixtures. Water-soluble fertilizer is a one-time application and requires mixing while slow-release fertilizer contains granules that break down over time. Use slow-release or granular fertilizer with the sprinkler system for long-term feedings.

Application

• Granular fertilizers require one application every two to three months. Sprinkle the recommended amount of fertilizer in a circle around each plant, shrub or tree, with at least 6 inches of space between the fertilizer and the plant. Fertilizer granules burn plant matter with direct contact. Turn the fertilizer into the top 4 to 6 inches of soil.

Watering

• Water the site immediately after the fertilizer application to help the granules dissolve. Use the sprinkler system as usual and keep the plants on their standard watering schedule. Fertilizer use does not change watering needs.

Other Care

• Complement feedings with other important care steps for soil quality and plant growth. Turn organic compost and garden loam into the soil for a loose, moist base and best in-soil drainage. Put 2 inches of organic mulch on the soil to maintain moisture and warmth during the season. Stop feeding the plants in mid-summer; late-summer and fall feedings lead to late growth that, in turn, leads to winter damage.