I am a landscape designer and have been purchasing 1000's of spring flowering bulbs from A.D.R. Bulbs for 100's of clients in the last 20 years. The bulbs have always been of top quality and if there were any problems, they have been quick to rectify. My orders are often complicated with many varieties and different amounts and they have always filled and delivered everything on time with the best customer care and attention to detail. The pictures in their catalog and website are beautiful. I have visited their facility in NY and was impressed with all their handling equipment and organization. I would highly recommend A.D.R. Bulbs to anyone in the wholesale trade who wants to purchase quality bulbs and work with genuinely nice people.

Nancy Greenlee , From The Ground Up

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Calla 'Schwarzwalder' (Ships in Spring)

Zantedeschia

Calla Lily 'Schwarzwalder' is a deep maroon-black variety with a velvety texture, creating a dramatic contrast against its dark green, speckled foliage. The chalice-shaped blooms are highly sought after in floral arrangements for their bold, exotic appeal. Blooming in midsummer, this variety thrives in full sun to part shade with organically rich, consistently moist, well-drained soil. Hardy in USDA zones 9 to 11, it is often grown as an annual in cooler climates, with bulbs lifted and stored for winter. 'Schwarzwalder' is deer-resistant and performs well in containers, borders, and cut flower displays.

Bulk Box of 25 Bulbs, Size 14+

47.50

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Growing and Maintenance Tips for Calla 'Schwarzwalder' (Ships in Spring)

Planting: In spring, plant rhizomes after the last frost when soil has warmed to at least 60°F. Set them just below the surface—about 3 to 4 inches deep—with the growing points facing upward.
Location: Choose a spot in full sun or partial shade. In hotter climates, afternoon shade helps prevent stress.
Soil: Use fertile, humus-rich, moist but well-drained soil.
Watering: Keep soil consistently moist during active growth, especially in dry spells. Avoid waterlogging.
Temperature: Ideal range is 60–75°F. In zones below 8, grow as annuals or lift rhizomes in fall.
Fertilization: Feed every 2–3 weeks with a high-potash fertilizer—liquid seaweed is a great organic option.
Pruning: Remove spent blooms and yellowing foliage to tidy the plant and encourage new growth.
Pest & Disease: Watch for aphids, thrips, and fungal issues. Ensure good air circulation and avoid soggy soil.
Propagation: Divide rhizomes in spring before planting.