Wicked Growth · Fertilizer Guide
Alpine/Rock Garden Plants Fertilizer
NPK 5-10-5Non-Organic
Old Cobblers Farm Rock Garden Fertilizer (5-10-5 NPK) is a gentle, low-nitrogen blend tailored for alpine plants, groundcovers, and flowering perennials that thrive in lean, well-drained soils. This formula encourages strong roots, vibrant flowers, and tidy, compact growth without overstimulation. The phosphorus-focused ratio delivers ...
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Nutrient Breakdown
N · Nitrogen
5%
5% Nitrogen supports healthy, compact foliage without excessive growth
P · Phosphorus
10%
10% Phosphorus strengthens roots and fuels bold, long-lasting blooms
K · Potassium
5%
5% Potassium improves stress tolerance and enhances flower quality
Derived from: Urea, Monoammonium Phosphate (MAP), Muriate of Potash (MOP), Pelletized Lime
Overview
What It Is
Old Cobblers Farm™ Alpine & Rock Garden Fertilizer is a low-nitrogen 5-10-5 formula designed for plants that evolved in harsh, nutrient-poor mountain environments. These species are adapted to lean soils and can actually be harmed by aggressive fertilization — excess nitrogen causes floppy, overgrown plants that lose their compact, tidy character.
The double-phosphorus ratio supports the one thing rock garden plants should do abundantly: bloom. Strong root systems in rocky, well-drained media require phosphorus support, while the low nitrogen and potassium keep growth compact and proportional.
The double-phosphorus ratio supports the one thing rock garden plants should do abundantly: bloom. Strong root systems in rocky, well-drained media require phosphorus support, while the low nitrogen and potassium keep growth compact and proportional.
Crop Fit
Best For
Sedum and hens-and-chicks are the classic rock garden succulents that need minimal feeding. Thyme and dianthus produce fragrant flowers and compact mats with gentle phosphorus support. Aubrieta and phlox subulata create cascading color over rock walls. Edelweiss and lewisia are true alpines that demand lean nutrition. All 16 recommended species prefer the less-is-more approach this formula provides.
Application Rates
How Much to Use
| Garden & beds | ½ cup per 10 sq ft |
|---|---|
| Lawn | N/A — formulated for alpine and rock garden plants, not turf |
| Trees & shrubs | N/A — formulated for alpine plants, not trees |
| Containers | ¼-½ cup depending on container size |
| Frequency | Every 6-8 weeks during active growing season |
Step by Step
How to Apply
1
New Planting
For new plantings, mix ½ cup per 10 sq ft into topsoil before planting. Alpine plants are sensitive to over-feeding.
2
Established Beds
For established beds, sprinkle ¼–1 cup depending on plant size and maturity.
3
Work In
Work lightly into soil around plants, being careful not to disturb shallow root systems.
4
Water In
Water thoroughly to activate nutrients and prevent granule burn on sensitive alpine species.
5
Less Is More
Less is more in rock garden environments. Alpine and rock garden plants thrive in lean soil — over-fertilizing causes leggy, weak growth.
New plantings: mix ½ cup per 10 sq ft into topsoil before planting. Established beds: small plants get ¼-½ cup, larger clumps or spreaders get up to 1 cup. Sprinkle evenly, work lightly into soil, and water thoroughly. Apply every 6-8 weeks during active growing season. Avoid over-fertilizing — rock garden plants perform best with minimal inputs.
Handling & Timing
Safety & Season
Safety & Storage
Store in a cool, dry place. Low-concentration formula is gentle to handle. Keep away from children and pets.
Seasonal Notes
Apply every 6-8 weeks during the active growing season. Avoid over-fertilizing — less is more in rock garden environments. Most alpine plants benefit from spring and early summer feeding only. Discontinue by mid-summer for species that go dormant in heat.
In Context
How It Compares
At 5-10-5, this is one of the lowest-analysis formulas in the Wicked Growth lineup. Compared to balanced 10-10-10, it provides half the nitrogen and potassium to prevent the overgrowth that ruins rock garden aesthetics. The phosphorus emphasis supports blooming in plants that flower abundantly despite lean conditions.
Answers
Frequently Asked Questions
What is the best fertilizer for rock gardens?
The best fertilizer for rock gardens is a gentle, low-nitrogen formula like 5-10-5 that encourages flowering and compact growth without overstimulating leggy foliage. Rock garden plants like sedum, thyme, hens and chicks, and alpine pinks naturally thrive in lean, well-drained soils and can be harmed by heavy fertilization. The higher phosphorus (10%) supports root strength and vivid blooms, while the low nitrogen and potassium keep growth tight and proportional. Old Cobblers Farm™ Wicked Growth Alpine / Rock Garden Fertilizer 5-10-5 is specifically formulated for the unique needs of rock garden and alpine plants.
How often should I fertilize rock garden plants?
Fertilize rock garden plants sparingly — every 6–8 weeks during the active growing season is sufficient. Most alpine and rock garden species are adapted to low-nutrient environments and can actually decline with too much fertilizer. Apply a light application in early spring as growth resumes and one more in early summer to support flowering. Avoid late-season fertilization, which can promote soft growth vulnerable to winter damage. Less is more with rock gardens. Old Cobblers Farm™ Wicked Growth Alpine / Rock Garden Fertilizer 5-10-5 provides gentle, steady feeding that respects the natural habits of these plants.
Can I use regular fertilizer on alpine plants?
Standard high-nitrogen fertilizers like 10-10-10 or lawn fertilizers can overstimulate alpine and rock garden plants, causing loose, floppy growth that loses the compact form these plants are prized for. Alpine species are adapted to lean soils and respond best to lower nutrient levels with an emphasis on phosphorus for flowering and root health. A formula like 5-10-5 provides the right balance. If you only have a general fertilizer available, use it at half the recommended rate. Old Cobblers Farm™ Wicked Growth Alpine / Rock Garden Fertilizer 5-10-5 delivers the precise nutrition alpine plants prefer.
What plants grow best in rock gardens?
Popular rock garden plants include sedum, thyme, aubrieta, creeping phlox, arabis, dianthus, edelweiss, ice plant, lewisia, saxifrage, hens and chicks, alpine pinks, campanula, dwarf penstemon, and euphorbia. These species share a preference for well-drained, gritty soils and can tolerate drought, heat, and poor soil conditions. Most bloom best when grown lean — without excessive nitrogen. A low-nitrogen, high-phosphorus fertilizer like 5-10-5 supports their flowering habit beautifully. Old Cobblers Farm™ Wicked Growth Alpine / Rock Garden Fertilizer 5-10-5 is formulated specifically for these hardy, beautiful plants.
How much 5-10-5 fertilizer for rock gardens?
For rock garden beds, apply ½ cup per 10 square feet, sprinkling evenly around plants and working lightly into the soil surface. For individual plants or small clumps, use ¼ to ½ cup per plant depending on size. For larger spreading groundcovers, use up to 1 cup per mature clump. Avoid piling fertilizer directly against plant crowns. Water thoroughly after application to move nutrients into the root zone. Remember that rock garden plants prefer lean conditions, so always err on the side of less. Old Cobblers Farm™ Wicked Growth Alpine / Rock Garden Fertilizer 5-10-5 delivers gentle, effective nutrition.
Is 5-10-5 fertilizer good for succulents?
Yes, 5-10-5 is well-suited for succulents and succulent-type rock garden plants like sedum, hens and chicks, and ice plant. These plants are adapted to low-nutrient conditions and respond poorly to high-nitrogen fertilizers that promote weak, elongated growth. The elevated phosphorus supports root health and flowering, while the low nitrogen and potassium keep growth compact and structurally sound. Apply sparingly during the active growing season and avoid winter feeding. Old Cobblers Farm™ Wicked Growth Alpine / Rock Garden Fertilizer 5-10-5 provides the restrained nutrition succulents and alpine plants prefer.
What NPK ratio is best for alpine plants?
Alpine plants perform best with a low-nitrogen, phosphorus-emphasized formula such as 5-10-5. This ratio promotes compact growth, vibrant blooms, and strong root systems without the excessive foliage that higher-nitrogen formulas produce. Alpine species evolved in environments with thin, mineral soils and limited organic matter, so they are naturally adapted to lower nutrient availability. A gentle, bloom-focused formula mimics these conditions while still providing essential nutrition for healthy growth. Old Cobblers Farm™ Wicked Growth Alpine / Rock Garden Fertilizer 5-10-5 provides the ideal NPK balance for alpine and rock garden species.
