When and Where to Plant Comfrey

Best Time to Plant Comfrey

The ideal times to plant comfrey are early spring and fall when soil moisture is high and temperatures are moderate. These conditions help the plant establish its root system before extreme weather arrives.

Spring Planting (Recommended)

Plant comfrey in early to mid-spring after the last frost has passed. This gives the plant a full growing season to establish before winter. Spring planting is ideal for most climates as it allows the comfrey to develop a strong root system during its natural growth period.

Fall Planting

In milder climates (USDA zones 6-9), fall planting can be successful. Plant at least 6 weeks before the first expected frost to allow roots to establish before winter dormancy. Fall-planted comfrey will often emerge earlier in spring than spring-planted comfrey.

Avoid Summer Planting

Try to avoid planting during the heat of summer, as young comfrey plants can struggle in hot, dry conditions. If you must plant in summer, provide extra water and some afternoon shade until established.

Where to Plant Comfrey

Comfrey is adaptable to various conditions but thrives in specific environments. Consider these factors when choosing where to plant:

Sunlight Requirements

Comfrey grows best in full sun to partial shade. In hot climates, afternoon shade is beneficial. Aim for at least 4-6 hours of direct sunlight daily for optimal growth. In very hot regions, some afternoon shade can prevent leaf scorching.

Soil Conditions

Comfrey prefers rich, moist soil but is adaptable to various soil types. The ideal soil pH is slightly acidic to neutral (6.0-7.0). While comfrey can tolerate clay soils, it performs best in loamy soil with good drainage and high organic matter content.

Space Requirements

Mature comfrey plants can spread 2-3 feet wide, so space plants at least 3 feet apart. The deep tap roots need unrestricted depth, so avoid planting over underground obstacles, utilities, or hardpan.

Strategic Placement in the Garden

Consider these strategic locations for planting comfrey:

• Around fruit trees: Comfrey makes an excellent companion plant for fruit trees, providing mulch and attracting pollinators.
• At the edge of garden beds: Easy access for harvesting without the plant spreading into your main growing areas.
• Near compost piles: Convenient for adding nutrient-rich leaves to your compost.
• As a windbreak: The large leaves can help protect more delicate plants.
• In swales or rain gardens: Comfrey's deep roots help prevent erosion and capture nutrients from water runoff.

Planting Considerations

Containment Strategies

While Bocking 14 comfrey won't spread by seed, it can spread via root fragments. If you're concerned about spreading, consider these containment strategies:

• Plant in containers or raised beds with barriers
• Surround plants with deep barriers (12+ inches) in the ground
• Maintain a mowed perimeter around comfrey patches
• Plant in isolated areas where spreading won't be an issue

Water Requirements

Comfrey is drought-tolerant once established but produces more biomass with consistent moisture. During establishment, water regularly to encourage deep root growth. Consider planting near areas that naturally collect water, such as swales or depressions.