Good soil is the foundation of a productive cutting garden. Most cut flowers want well-drained, fertile soil with plenty of organic matter. Investing time in soil preparation before planting pays dividends all season long.
A soil test from your local cooperative extension office tells you your pH, nutrient levels, and organic matter content. Most cut flowers prefer a pH between 6.0 and 7.0. A soil test costs very little and removes the guesswork. Find your local extension office through the USDA directory.
Spread 2–4 inches of compost over the bed and work it into the top 8–12 inches of soil. Compost improves drainage in clay soil and water retention in sandy soil. If pH is too low, add lime; too high, add sulfur. For specific crop needs, check individual flower guides like lisianthus (prefers slightly alkaline) or foxglove (prefers slightly acidic).
If your native soil is very poor, raised beds filled with a mix of topsoil and compost give you a fresh start. See raised bed guide and small-space gardening for more.
Top-dress beds with compost between crops. Use mulch to protect soil biology and suppress weeds. Rotate flower families between beds each year when possible to prevent soil-borne disease. Fertilizing supplements what the soil provides.