Wicked Organics Organic Organic OMRI Listed

Asparagus Fertilizer

NPK 4-6-4

Organic Asparagus Fertilizer (4-6-4) is a natural fertilizer blended from mineral and organic ingredients, specially formulated for the unique long-term nutritional demands of perennial asparagus beds. Asparagus crowns remain productive in the ground for 15-20 years, making organic soil health the foundation of sustained yields — and this OMRI-listed formula feeds the soil first and plants second. The 6% phosphorus supports the deep, fleshy root system that asparagus depends on for decades of production, while the 4% nitrogen (split between water-soluble and water-insoluble forms) fuels the summer fern growth that photosynthesizes and stores energy in the crown for next spring's spear harvest. The 4% potassium strengthens disease resistance — particularly against Fusarium wilt, the most common asparagus disease — and improves the winter hardiness that this perennial crop requires in northern growing zones. The slow-release natural ingredients provide nutrients through microbial activity, building the living soil ecosystem that sustains asparagus beds year after year without the salt buildup and microbial suppression that synthetic fertilizers can cause over decades of repeated application. Old Cobblers Farm™ Wicked Organics Organic Asparagus Fertilizer is the organic grower's choice for building asparagus beds that produce thick, tender spears for generations.

Application Rates FAQs
Nutrient Profile
WO-ORG-ASPARAGUS
4–6–4
Asparagus Fertilizer
Derived From
  • Elemental Sulfur, Animal Protein Meals, Vegetable Protein Meals, Natural Sulfate of Potash, Natural Nitrate of Soda, Bone Char
4-6-4
NPK Ratio
Organic
Formula Type
Twice per year — early spring before spear emergence, and immediately after final harvest (late June/July) to support fern growth. If only one application, choose post-harvest.
Feeding Frequency
—
Compatible Plants
What It Is

Understanding 4-6-4

Wicked Organics Organic Asparagus Fertilizer is a 4-6-4 organic blend formulated from Elemental Sulfur, Animal Protein Meals, Vegetable Protein Meals, Natural Sulfate of Potash, Natural Nitrate of Soda, and Bone Char. This is the same proven formula used in the Wicked Organics Blueberry and Evergreen fertilizers — a blend specifically designed for plants with deep root systems and long productive lifespans.

The guaranteed analysis shows 4.0% Total Nitrogen (1.5% Water Soluble, 2.5% Water Insoluble), 6.0% Available Phosphate, and 4.0% Soluble Potash. The water-insoluble nitrogen releases slowly through microbial activity, matching the gradual nutrient uptake pattern of asparagus — a perennial that absorbs nutrients steadily over months rather than in rapid bursts.

Asparagus has two critical feeding windows: before spear emergence in spring, and after final harvest when the fern growth phase begins. The post-harvest application is arguably more important because fern growth is when the plant banks the carbohydrate energy that determines next year's spear quality and quantity. This organic formula's slow-release characteristics make it particularly well-suited for this purpose, providing sustained nutrition through the entire fern growth period.

N
Nitrogen — 4%

4.0% Total Nitrogen (1.5% Water Soluble, 2.5% Water Insoluble) — provides both immediate and slow-release nitrogen to fuel fern growth in established asparagus beds, which is critical for photosynthesis and crown energy storage for next spring's spear harvest.

P
Phosphorus — 6%

6.0% Available Phosphate (P2O5) — supports the deep, fleshy root system that asparagus crowns depend on for 15-20 years of productive life, and promotes strong spear emergence each spring.

K
Potassium — 4%

4.0% Soluble Potash (K2O) — strengthens cell walls, improves disease resistance including Fusarium wilt tolerance, enhances winter hardiness, and supports overall crown vigor in this long-lived perennial crop.

Recommended Plants

Best For

Asparagus
Rhubarb
Artichokes
Horseradish
Perennial Herbs
Perennial Vegetables

Growing Detail

Asparagus is the primary target — this formula addresses every nutritional requirement of this long-lived perennial crop including the phosphorus for deep root systems, nitrogen for fern production, and potassium for disease resistance and winter survival. Rhubarb shares asparagus's need for sustained organic nutrition in a permanent bed. Artichokes are heavy-feeding perennials that respond well to the balanced organic NPK. Horseradish benefits from the phosphorus for root development. Perennial herbs like oregano, thyme, and chives gain balanced nutrition that supports long-term crown health without excessive nitrogen that reduces flavor concentration.
Dosing Guide

Application Rates

Garden Beds
2-3 lbs per 100 sq ft for established asparagus beds; 3-4 lbs per 100 sq ft for new bed preparation
Container / Pot
N/A — asparagus is not typically container-grown
Water Mix
N/A — granular application
Lawn
N/A — crop-specific fertilizer formulated for asparagus beds
Trees
N/A — not formulated for tree application
Per Acre
870-1,300 lbs per acre for commercial asparagus production
Frequency
Every 2-4 weeks

How to Apply

Seasonal Notes

Spring: Apply before spear emergence when soil becomes workable. Summer: Apply immediately after final harvest (late June/July) to fuel fern growth and crown energy storage — this is the most critical application. Fall: Do not apply. Allow ferns to naturally die back, then mow and mulch. Winter: No application. Plan soil testing for spring.
How It Compares

Side by Side

Compared to the synthetic Wicked Growth Asparagus Fertilizer (16-10-13), this organic 4-6-4 delivers lower immediate nutrient concentration but feeds the soil ecosystem for longer-lasting results and eliminates the salt buildup risk that comes with decades of synthetic application in permanent asparagus beds. The organic formula builds microbial populations that improve nutrient cycling, water retention, and disease suppression — outcomes that matter enormously in a crop that stays in the ground for 15-20 years. The 16-10-13 is the better choice for maximum immediate production; the 4-6-4 organic is the better choice for long-term bed health and organic certification.

Safety & Storage

Store in a dry environment. Natural product with no known hazards. Wear a dust mask if sensitive to fine particles. Wear gloves if skin sensitivities appear. Wash hands after use.

Got Questions?

Frequently Asked

  • The best organic asparagus fertilizer provides elevated nitrogen from natural sources to fuel the fern growth that asparagus depends on for next year's spear production. A formula like 4-6-4 made from elemental sulfur, protein meals, bone char, and sulfate of potash delivers balanced organic nutrition with the nitrogen emphasis asparagus needs. The slow-release organic ingredients feed asparagus crowns steadily without burn risk. Old Cobblers Farm™ Wicked Organics Organic Asparagus Fertilizer is purpose-built for organic asparagus beds, delivering natural nutrition for bigger, more productive spear harvests.
  • Apply organic asparagus fertilizer twice per year: in early spring before spears emerge, and in late summer after the harvest season ends. Broadcast 5–8 pounds per 100 square feet of bed area, extending 2–3 feet on both sides of the row. Remove mulch before applying, incorporate lightly into the soil surface, then replace the mulch. Water thoroughly. Organic fertilizers take 1–2 weeks to become fully available, so apply slightly earlier than you would with synthetics. Old Cobblers Farm™ Wicked Organics Organic Asparagus Fertilizer provides the sustained organic nutrition asparagus beds need year after year.
  • Wicked Organics Organic Asparagus Fertilizer is formulated from elemental sulfur, vegetable protein meals, animal protein meals, natural sulfate of potash, nitrate of soda, and bone char. Elemental sulfur provides sulfur nutrition and mild soil acidification. Protein meals deliver slow-release nitrogen for sustained fern growth. Bone char contributes phosphorus and calcium for crown health. Sulfate of potash provides chloride-free potassium for stress resistance. All ingredients are OMRI-Listed for organic production. Old Cobblers Farm™ uses only premium natural ingredients for effective organic asparagus nutrition.
  • Yes, organic asparagus fertilizer can be used on other vegetables, though it is specifically optimized for asparagus. The balanced nutrient profile works well for heavy-feeding vegetables like broccoli, cabbage, cauliflower, and corn that benefit from higher nitrogen. For a more versatile organic vegetable fertilizer, consider Wicked Organics 5-3-4 or 10-2-8, which are designed for broader garden applications. Old Cobblers Farm™ Wicked Organics offers specialized formulas for asparagus, tomatoes, herbs, and general gardening to match the specific needs of each crop type.
  • For asparagus rows, apply approximately 1 pound of organic fertilizer per 2 linear feet of row, broadcasting in a band 2–3 feet wide on both sides of the crowns. For 100 feet of row, use approximately 50 pounds. For small home garden beds, use 5–8 pounds per 100 square feet. The higher application rates for organic fertilizer compared to synthetic reflect the lower nutrient concentration of natural ingredients. Old Cobblers Farm™ Wicked Organics Organic Asparagus Fertilizer is gentle and safe at these rates, with virtually no risk of crown burn.
  • Both organic and synthetic asparagus fertilizers effectively feed asparagus when applied correctly. Organic fertilizer offers additional benefits: it builds soil health and biology over time, reduces burn risk, provides trace minerals, and aligns with organic growing practices. Synthetic fertilizer offers faster nutrient availability and higher concentration per pound. Many asparagus growers combine both approaches — using organic for soil building and synthetic for targeted nutrition when needed. Old Cobblers Farm™ offers both Wicked Organics Organic Asparagus Fertilizer and Wicked Growth Asparagus Fertilizer 16-10-13 for flexible program design.
  • Yes, Old Cobblers Farm™ Wicked Organics Organic Asparagus Fertilizer is OMRI-Listed for certified organic production. Every ingredient meets the Organic Materials Review Institute's strict standards for organic agriculture. This certification is important for organic asparagus growers selling at farmers markets, CSAs, or through organic retail channels where certified organic status adds value. Home gardeners also benefit from OMRI certification as assurance of genuinely organic ingredients. Old Cobblers Farm™ Wicked Organics carries the OMRI seal across its entire organic fertilizer line.

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