Through the years I've tried just about everyone for bulbs but A.D.R. is tops. It's a family run business and the service levels and expertise are as good as the product they sell. My clients rave about the results we get with A.D.R. and that makes me happy.
Paul Keyes
, Paul Keyes Associates
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Allium Tall 'Nigrum' (Multibulbosum)
Ornamental Onion
Allium bulbs are splendid for naturalizing if planted in rich, well drained soil
Scent keeps deer, rodents & rabbits at a distance
Beloved by bees, butterflies & pollinators
- » Ideal for mass plantings as cost effective, uniquely shaped alternatives to their Giant cousins
- » Blooms in Late Spring - Early Summer
Allium Calculator
Growing and Maintenance Tips for Allium Tall 'Nigrum' (Multibulbosum)
All wholesale Spring flowering bulbs must be planted in the Fall
Soil temperatures must be 55 F or below to ensure proper root development
The optimal planting time is when night-time temperatures are 40-50 F
The ideal soil pH level for flower bulbs is between 6 and 7
Most flower bulbs require a minimum cold frame of 6 weeks to root properly
Plant Characteristics
Additional Information
| Height | 24 Inches |
| Spread | 2-4 Inches |
| Spacing | 6-8 Inches |
| Hardiness Zone | 4-7 |
| Color |
White |
Storage Tips
Store flower bulbs in a cool, dry spot with good air circulation and low humidity
Most flower bulbs can tolerate temperatures between 38 and 70 F
Protect from heat, frost and strong sunlight
Pre-cooled flower bulbs for the South must be planted immediately
Avoid These Common Pitfalls
Not sure if a flower bulb is viable? Look for flower bulbs that are firm to the touch
Flower bulbs hate "wet feet" - never plant in areas with poor drainage or standing water
Planting when the soil temperature is too warm is the primary cause of stunted blooms
Road salt and de-icing compounds are harmful to flower bulbs - avoid areas where plowed snow accumulates
Crop rotation is key - don't plant the same type of flower bulb in the same spot year after year to protect against Rhizoctonia
Don't plant too shallow - it's essential that flower bulbs are planted at least 3 times their height into the soil
Plant flower bulbs firmly in the soil with their pointy end up and basal plate down - not all flower bulbs will right themselves underground
Avoid areas that do not receive at least half a day of sun
Plant bulbs away from invasive tree and perennial root systems that can strangle flower bulb roots & compete for limited water and nutrition
Wholesale Only Flower Bulbs Direct From Our Family Farms in Holland
A.D.R. Bulbs supplies wholesale allium flower bulbs, specializing in bulk alliums for landscape professionals & retail packaged allium bulbs for garden centers
Top size, elite quality, wholesale only flower bulbs since 1946