How to Protect Sweet William from Pests and Poor Soil

Overview

Sweet William (Dianthus barbatus) is part of the Dianthus genus, including annual, biennial, and perennial species. Growing 6–18 inches tall with 1-inch fringed blooms in pink, white, red, or multicolor. Easy to grow but needs protection from poor soil, over-fertilizing, and pests.

Protection Steps

Step 1: Amend Soil Early

One month before planting, enrich soil with generous well-rotted compost or manure. For heavy clay, add peat moss.

Step 2: Fertilize Sparingly

Apply complete plant food in early spring at active growth onset. Avoid over-fertilizing—excess nitrogen causes brown leaf tips.

Step 3: Control Pests

Spray with malathion for aphids. Circle plants with crushed eggshells or diatomaceous earth to deter slugs.