Diplotaxis catholica: complete guide

Overview

Diplotaxis catholica is an interesting plant from the Brassicaceae family, originating from the Western Mediterranean region, particularly Portugal, Spain, and Morocco. Also known as "Diplotaxis catholique" in French or "Allgemeiner Doppelsame" in German, this plant is increasingly found in temperate zones and is gaining popularity as a garden vegetable.

It is an herbaceous plant that bears many similarities to rocket, but with a milder flavor. The plant is edible and nutrient-rich, with leaves full of vitamins and minerals. In Europe, it becomes increasingly popular in hobby gardens because it is easy to grow and provides a long harvest period.

Appearance and bloom

Diplotaxis catholica has dark green, deeply divided leaves that resemble those of broccoli rabe but much finer-cut. The plant forms a compact rosette in the first year, with height ranging from approximately 30 to 50 centimeters.

Flowers appear in spring and summer in yellow to creamy white, and are edible and highly attractive to pollinators. The flowers group together in typical cruciferous arrangement. After flowering, long, slender seed pods form.

Ideal location

Diplotaxis catholica grows best in full sun to partial shade. Choose a location with at least 4-5 hours of direct sunlight per day. The plant also grows in partial shade in warmer climates.

From a biological standpoint, it is suitable for borders, beds, containers, or even as cut greens in vegetable gardens. The plant also lends itself to pots on patios or balconies.

Soil

Diplotaxis catholica prefers well-draining, nutrient-rich soil. A pH range of neutral to slightly acidic (6.0 to 7.5) is ideal. The plant can also grow in moderate soils, but grows better with some nutrition.

Improve heavy soil with compost or other organic matter. Ensure good drainage to prevent root rot. Moderate garden fertilizer helps leaf growth.

Watering

Diplotaxis catholica requires regular watering, especially during the growing period. Keep the soil consistently moist but not waterlogged. Water when the top inch feels dry.

Water more frequently during dry periods. The plant tolerates some drought once established, but prefers consistently moist soil for best leaf quality. Watering at the base helps prevent disease.

Pruning

Diplotaxis catholica benefits from regular harvesting of leaves and flowers. Begin harvesting leaves when they are at least 4 centimeters long. Regular harvesting encourages more leaf growth and prevents premature flowering.

If you want flowers for the table or insect food, allow some plants to flower. After flowering, spent flower stems can be cut off.

Maintenance calendar

Spring (March-May): Sow seeds directly or plant seedlings. Begin harvesting leaves regularly as the plant grows. Water regularly. Summer (June-August): Harvest leaves and flowers. Maintain watering especially during dry periods. Protect against extreme heat. Fall (September-November): Continue harvesting. In cooler climates sow fall planting. Gradually reduce watering. Winter (December-February): In mild zones harvesting can continue. In colder zones plant is dormant or dies back.

Winter hardiness

Diplotaxis catholica is hardy in zones 6-10 (minimum temps to about -18 degrees C). In colder zones grow as annual. The plant can also grow in winter in mild maritime climates.

In zones 6-7 protect plant with mulch or tunnels in severe winters. In zones 8-10 the plant can remain vegetatively active through winter.

Companion plants

Diplotaxis catholica combines well with:

• Other vegetable-like herbs: Eruca (rocket), chicory, mizuna
• Mediterranean herbs: rosemary, oregano, thyme, sage
• Vegetables: tomatoes, peppers, cruciferous plants
• Flower mixes: calendula, cosmos, borage

The plant fits well in amalgamated food gardens or in herb characteristics.

Closing

Diplotaxis catholica is a nutrient-rich, flavorful and ornamentally attractive plant that grows successfully in the small front yard. With minimal maintenance it provides nutrition from spring to fall and attracts insects. Sow directly in the ground or as transplants in pots. Harvest regularly for table or drying. More gardening ideas for nutritious front yards can be found at gardenworld.app or at local garden centers.