Organic Media Specification for Zantedeschia (Calla Lily) Cultivation

Organic-Based Growing Medium for Zantedeschia

Water Holding Capacity:

  • High: The substrate must have excellent water-holding capacity to ensure consistent moisture levels for Calla lilies, particularly during the growing and flowering stages.

Cation Exchange Capacity (CEC):

  • High: CEC is important for Calla lilies, a good CEC is beneficial for retaining essential nutrients and making them available to the plants.

Air Porosity:

  • Moderate to High: Adequate air porosity is crucial for providing oxygen to the roots, promoting healthy growth and preventing waterlogged conditions.

Organic Media Composition:

  • Primary Component: Coco peat or Coir (or Peatmoss)

    • Provides a well-structured base with good water-holding capacity and aeration.

  • Supplemental Components:

    • Composted Organic Material: Adds nutrients and improves soil structure.
    • Perlite or Vermiculite: Enhances aeration and drainage.

  • pH Adjustment:

    • The substrate pH should ideally be between 5.5-6.5, which is slightly acidic to neutral, to support optimal Calla lily growth.

Moisture Content:

  • The substrate should be moistened before planting to achieve the desired water holding capacity. Maintain consistent moisture levels, avoiding waterlogging.

Particle Size:

  • Components should be well-mixed to achieve uniformity in the substrate. Coarser particles provide better aeration and drainage, while finer particles enhance water retention.

Mixing and Formulation:

  • Thoroughly mix the organic components to ensure uniform distribution of nutrients and moisture-holding capacity throughout the substrate.

Sterility and Contamination Control:

  • Maintain a clean environment during substrate preparation to prevent the introduction of unwanted pests or diseases.

Aeration and Drainage:

  • Adequate aeration and drainage are crucial for root health. Properly formulated organic media allows roots to access oxygen while preventing waterlogged conditions.

Monitoring and Adjustments:

  • Regularly monitor soil moisture levels, pH, and nutrient content to ensure optimal conditions for Calla lily growth. Adjustments may be made as needed.

Note: The organic media specifications may vary based on specific Calla lily varieties, local soil conditions, and climate. Always refer to specific guidelines provided by trusted sources or experienced Calla lily growers for the best results.

Professional Calla Lily Cultivation Manual

Cultivating Zantedeschia, commonly known as Calla lilies, requires careful attention to their specific needs. This manual provides comprehensive guidance for successfully growing healthy and vibrant Calla lilies.

  1. Calla Lily Varieties and Selection

    • Choose Calla lily varieties based on intended use (cut flowers, container gardening), climate suitability, and personal preference for color and form. Professional breeders and suppliers: VandenBos Flower Bulbs and Onings Flowerbulbs.

  2. Site Selection and Preparation

    • Select a site with well-drained soil and partial to full sunlight exposure. Avoid low-lying areas prone to waterlogging.

  3. Soil Conditions and Amendments

    • Conduct a soil test to determine pH and nutrient levels. Amend soil with organic matter and necessary nutrients to achieve optimal conditions.

  4. Planting and Spacing

    • Plant Calla lily rhizomes at a depth of 2-4 inches, spaced 12-18 inches apart. Ensure the growing points are facing upward.

  5. Watering and Moisture Management

    • Provide consistent moisture, keeping the soil evenly moist but not waterlogged. Use mulch to retain soil moisture and suppress weeds.

  6. Light and Temperature Requirements

    • Calla lilies prefer partial to full sunlight. In hotter climates, provide some shade during the hottest parts of the day.

  7. Nutrient Management

    • Apply a balanced fertilizer before planting and during the growing season. Monitor nutrient levels and adjust fertilizer application as needed.

  8. Pest and Disease Control

    • Monitor for common pests (aphids, spider mites) and diseases (powdery mildew, bacterial soft rot). Implement integrated pest management (IPM) strategies.

  9. Pruning and Deadheading

    • Remove spent flowers to encourage continuous blooming. Trim yellowing or damaged leaves to maintain plant health.

  10. Overwintering (for colder climates)

    • In colder climates, consider lifting the rhizomes before the first frost, allowing them to dry, and storing them in a cool, dry place for the winter.

  11. Harvesting and Post-Harvest Handling

    • Harvest Calla lilies when the flowers are fully open. Cut stems at an angle and place them in fresh water immediately.

  12. Quality Control and Record-Keeping

    • Establish quality control standards for flower size, color, and overall appearance. Keep records of planting dates, varieties, and harvest yields.

  13. Sustainability and Environmental Considerations

    • Implement sustainable practices such as composting, using natural pest control methods, and conserving water.

  14. Troubleshooting and Problem-Solving

    • Regularly inspect plants for signs of stress, disease, or pest damage. Address issues promptly using appropriate measures.

  15. Market Considerations and Trends

    • Stay informed about market trends, consumer preferences, and emerging Calla lily varieties to adapt production practices accordingly.

This manual provides a comprehensive framework for successful Calla lily cultivation. Continuous monitoring, adjustment of practices, and attention to quality are essential for consistent high-quality blooms.