How to plant zantedeschias (calla lilies) in spring

Commonly known as calla lilies or arum lilies, zantedeschias are exotic, elegant plants native to South Africa bearing beautiful waxy spathes held above lush, long green leaves with fluted edges. Providing years of colour to the garden, these robust beauties will thrive planted in a moist border or container — they can also be grown as marginal aquatics. Depending on the area, their foliage can be semi-evergreen to evergreen. Try planting in bold clumps or mix with a selection of agapanthuses, hemerocallises, irises siberica or kniphofias. They make long-lasting cut flowers.

How to Plant and Grow Zantedeschia

• Plant Zantedeschia rhizomes just below the surface in fertile, humus-rich, moist, well-drained soil.
• They perform best in partial shade or full sun.
• If planting as marginal aquatics, use aquatic compost, and for container planting, opt for John Innes Compost №2.
• Feed every two weeks with a high-potash fertiliser; liquid seaweed is an excellent organic option.
• Apply a generous mulch of organic matter around the base in late autumn. 
• During winter, remove any frost-damaged leaves and protect the crown with straw or a deep mulch of bark chippings.
• Important Note: Zantedeschias are toxic to cats and dogs. Always wear gloves when handling them and store them in a cool place upon arrival until ready to plant.

Common Problems, Pests, and Diseases

• Aphids:
  These sap-sucking insects can weaken plants and spread viruses. Remove them by hand (wearing gloves) or use an organic insecticidal soap.
  
• Thrips:
  Thrips feed on leaf and flower tissues, causing mottled, discoloured spots and preventing buds from opening. To control infestations, cut back affected foliage and use organic sprays. Keep plants well-watered and remove debris to reduce risks.
  
• Bacterial/Fungal Rots:
  These diseases, caused by wet, heavy soils, lead to yellowing foliage, wilting, and stunted growth. Dig out and destroy affected bulbs, corms, or tubers, and disinfect tools to prevent the spread.
  
• Viruses:
  Viral infections can cause deformed leaves, unusual colour patterns, or streaking. Remove and destroy infected plants immediately to prevent the spread of the disease.