Calla lily

Growing in Pots, Balconies & Indoors

Calla lily (Zantedeschia aethiopica) is a genuine houseplant – the grower confirms it grows well indoors and in containers. Give it bright, indirect light and steady moisture and it will flower happily on a shaded patio or in a bright room.

Quick Details

• Container Size: Roughly 10-20 L (2.5-5 gal), or smaller for a single rhizome
• Indoor Suitability: A good houseplant in bright, indirect light
• Best Spot: Bright, indirect light indoors; part to full shade outdoors
• Soil & Drainage: Rich, moisture-retentive but free-draining mix (potting mix with some organic matter)
• Watering in Pots: Keep the mix consistently moist during growth – it enjoys plenty of water but the pot must still drain freely

Indoors & On the Windowsill

• A genuine houseplant: The grower marks it Yes for indoors – give it a bright spot out of harsh direct sun and keep the mix moist while it is in growth.
• Rest period: After flowering, ease off watering and let it rest; then resume watering to start it into growth again.
• Safety: All parts of Zantedeschia are toxic if chewed (calcium oxalate) and the sap can irritate skin – keep it away from children and pets.

On a Balcony or Patio

• Light, wind & heat: It prefers cool shade to part shade – an east-facing or sheltered balcony is ideal; protect it from harsh midday sun and drying wind. Pots still dry faster than open ground, so check moisture often.
• Practicalities: A full pot is heavy once watered – make sure the balcony can take the load and that drainage runoff has somewhere to go.

Choosing the Pot, Soil & Long-Term Care

• Pot & drainage: Use a pot with strong drainage holes and skip a standing-water saucer to avoid root rot. Terracotta breathes and dries faster; glazed or plastic pots hold moisture longer.
• Potting mix: A well-aerated, organic-rich mix – potting mix or peat/coir blended with perlite or vermiculite for free drainage.
• Feeding: Potted plants need feeding more often than those in open ground, as nutrients leach out with each watering – feed regularly through the growing season.
• Long-term care: As a perennial bulb, let the foliage die back after flowering; lift and divide crowded clumps and refresh the mix every couple of years.

Bloom & Flower Guide

Quick Details

• Bloom Season: Spring, into summer where there is moisture, and autumn; it may go dormant in a dry summer
• Flower Appearance: A pure white funnel-shaped spathe, 0.5-1 m tall, wrapped around a yellow central spike (spadix)
• Edibility: Toxic – not edible; contains calcium oxalate and the sap can irritate skin

Detailed Blooming Overview

What we admire as the calla lily flower is really a single large white bract, or spathe, curled into an elegant cone around a yellow central column called the spadix. The true flowers are the tiny ones packed along that spadix. Given steady moisture the plant blooms from spring into summer and autumn, though it will rest through a dry summer. It is a superb, long-lasting cut flower – but every part is toxic, so it is strictly one to enjoy by eye.

Flower Characteristics

• A smooth, funnel-shaped white spathe on a tall, clean stem.
• A yellow spadix at the centre carries the true, tiny flowers.
• Elegant and long-lasting, whether in the garden or the vase.

Bloom Care & Thinning

• Encouraging bloom: Keep the plant reliably moist through the growing season for the best and longest flowering.
• Upkeep: Cut spent spathes away at the base to keep the clump tidy; it makes an excellent cut flower.
• Safety: Wear gloves when cutting, as the sap irritates skin, and keep all parts away from children and pets – the whole plant is toxic if eaten.