🥦 Asparagus
Asparagus officinalis
vegetables
perennial vegetable (asparagaceae)
Asparagaceae
☀️ Sun
Full sun (8+ hours) essential; asparagus planted in shade produces thin, weak spears and depleted crowns over time
💧 Water
Medium; 1, 1.5 inches per week during first 2 establishing years; established crowns are remarkably drought-tolerant (deep root system reaches 10+ feet); supplement water during fern growth stage (summer after harvest)
🗺️ Zones
3, 4, 5, 6, 7, 8
🧪 Soil pH
6.5, 7.5 (neutral to slightly alkaline); tolerates pH up to 8.0
🪴 Soil Type
Deep, rich, well-drained sandy loam; asparagus is a perennial that occupies the same bed for 15, 25+ years , prepare soil deeply (12, 18 inches) with generous compost, aged manure, and rock phosphate (for root development); heavy feeder
🚿 Drainage
Excellent drainage ESSENTIAL , asparagus crowns rot in waterlogged soil; raised beds or mounds recommended in heavy clay areas
📏 Spacing
Crowns 12, 18 inches apart in rows 3, 5 feet apart; crowns planted in trenches 6, 12 inches deep, gradually filled as spears grow
📐 Height
36-60 in (ferns)
⏱️ Maturity
2-3 years (from crowns); harvest lightly in second year, fully from third year onward
🍴 Edible Parts
🍽️ Young spears/shoots (the only edible part , harvested at 6, 10 inches tall)
🍽️ Mature fern fronds (NOT edible , toxic; the ferny growth feeds the crown for next year's harvest)
🍽️ Berries (red berries on female plants are TOXIC , do not eat)
Key:🤝 Grows well together❌ Keep apart☀️ Sun needs💧 Water🗺️ Hardiness zone
🤝 Companions (13)
Repels asparagus beetles and aphids; attracts pollinators during fern stage
Chives repel asparagus beetles and aphids; their antifungal sulfur compounds benefit asparagus health. Recommended by WVU Extension as a beneficial companion.
Attracts predatory wasps and lacewings that eat asparagus beetle larvae
Historical companion , traditional farm interplanting; asparagus supposedly improves grape growth; both deep-rooted perennials
Universal garden companion; deters pests and attracts beneficials
Repels nematodes and asparagus beetles; general pest deterrent; adds color to asparagus bed during fern stage
Trap crop for aphids; repels asparagus beetles; ground cover suppresses weeds between asparagus rows IMPORTANT management caveat: without active management, nasturtiums can become a SOURCE of aphids that migrate to nearby crops. Either remove aphid-infested nasturtium plants promptly, or treat the trap crop itself to eliminate the aphid colony before it spreads. Strategic placement within 4-5 feet of protected crops is key.
Parsley repels asparagus beetles; improves asparagus vigor; grows in asparagus's dappled shade after spear harvest
Strawberries as ground cover between rows; different harvest seasons; strawberries benefit from asparagus's soil conditioning
Classic companion , tomatoes repel asparagus beetle with solanine in their leaves; asparagus may deter root nematodes that affect tomatoes; different root depths
⚠️ Keep Apart (9)
Allelopathic , inhibits asparagus growth and may kill young crowns
Alliums compete with asparagus
Aggressive mint competes for resources
Onions stunt asparagus growth
Potatoes compete with asparagus crown roots; potato harvesting disturbs the permanent asparagus bed
Susceptible to juglone toxicity from walnut trees
💊 Medicinal Uses
Medicinal Properties
- Excellent source of vitamin K (1 cup = 50%+ daily value), folate, and vitamin C
- Contains asparagine , a diuretic amino acid; asparagus consumption causes the well-known 'asparagus urine' odor (genetic ability to smell it varies)
- Rich in glutathione , a master antioxidant important for detoxification and immune function
- Traditional diuretic and kidney tonic; used in herbal medicine for urinary tract health
- Contains inulin , prebiotic fiber supporting gut microbiome; good source of rutin (blood vessel health)
📝 Growing Notes
Asparagus is a LONG-TERM investment , crowns live and produce for 15, 25+ years. DO NOT harvest the first 2 years (let all spears fern out to build crown strength). Year 3: harvest for 2, 4 weeks. Year 4+: harvest for 6, 8 weeks. Male hybrids ('Jersey' series) are 3× more productive than female plants (no energy wasted on berries). Plant crowns in trenches, covering gradually. The fern stage (after harvest) is critical , let ferns grow ALL summer without cutting to feed the crown. Cut ferns only after they've yellowed in late fall. Asparagus beetle is the main pest , hand-pick larvae; chickens in the patch during fern stage are excellent organic control. Patience is rewarded , a well-established bed produces daily spears for 2 months every spring.
🛒 Buy Seeds & Plants
Baker Creek Heirloom Seeds
Johnny's Selected Seeds
Botanical Interests
True Leaf Market
Burpee
Territorial Seed Company
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