Wicked Growth · Fertilizer Guide
Deciduous Shrubs Fertilizer
NPK 10-10-10Non-Organic
Old Cobblers Farm Deciduous Shrub Fertilizer (10-10-10 NPK) is a balanced, all-purpose formula designed for flowering and foliage-rich shrubs that shed their leaves each fall. This nutrient-rich blend strengthens root systems, energizes spring bud break, and promotes lush foliage and bountiful blooms throughout the growing season. Idea...
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Nutrient Breakdown
N · Nitrogen
10%
10% Nitrogen promotes lush, green leaves and strong stems
P · Phosphorus
10%
10% Phosphorus supports deep root growth and flower bud development
K · Potassium
10%
10% Potassium increases resilience, disease resistance, and overall plant health
Derived from: Urea, Monoammonium Phosphate (MAP), Muriate of Potash (MOP), Pelletized Lime
Overview
What It Is
Old Cobblers Farm™ Deciduous Shrub Fertilizer is a balanced 10-10-10 granular blend for seasonal shrubs. Deciduous shrubs face a unique nutritional challenge — they must grow an entirely new canopy of leaves every spring, bloom during summer, and store enough energy in their roots to survive winter dormancy.
Balanced 10-10-10 nutrition supports all three phases: nitrogen for spring leaf production, phosphorus for root energy storage and bloom development, and potassium for disease resistance and winter hardiness.
Balanced 10-10-10 nutrition supports all three phases: nitrogen for spring leaf production, phosphorus for root energy storage and bloom development, and potassium for disease resistance and winter hardiness.
Crop Fit
Best For
Lilacs need balanced feeding for both fragrant blooms and vigorous foliage. Forsythia benefits from spring nutrition to support its early-season flower display. Spirea and ninebark develop dense, colorful foliage with even nutrient supply. Hydrangeas (panicle, smooth, and oakleaf) need balanced macronutrients — bloom color is controlled by soil pH, not fertilizer ratio. All 15 recommended shrubs are seasonal growers that benefit from complete nutrition.
Application Rates
How Much to Use
| Garden & beds | ½-3 cups per plant depending on size |
|---|---|
| Lawn | N/A — formulated for deciduous shrubs, not turf |
| Trees & shrubs | N/A — formulated for shrubs, not trees |
| Containers | ½ cup per container shrub |
| Frequency | Every 6-8 weeks from early spring through mid-summer |
Step by Step
How to Apply
1
New Planting
Mix ½ to 1 cup into backfill soil when planting new shrubs. This places nutrients directly in the root zone.
2
Established Shrubs
For established shrubs, apply around the drip line where feeder roots are most active. Avoid trunk/stem contact.
3
Incorporate
Lightly incorporate into topsoil with a rake or hand cultivator for better nutrient-soil contact.
4
Water In
Water deeply after application to carry nutrients down to the root zone and activate slow-release components.
New plantings: mix ½ to 1 cup into backfill soil. Established shrubs: small shrubs get ½ cup, medium shrubs 1 cup, large shrubs 2-3 cups. Apply evenly around the drip line, avoiding trunk/stem contact. Lightly incorporate into the topsoil and water deeply. Feed every 6-8 weeks from early spring through mid-summer. Discontinue in late summer to allow plants to harden off before winter.
Handling & Timing
Safety & Season
Safety & Storage
Store in a dry location in original bag. Wear gloves when handling large amounts. Keep away from water sources.
Seasonal Notes
Apply every 6-8 weeks from early spring through mid-summer. Discontinue in late summer to allow plants to harden off before winter. First application should coincide with spring bud break for maximum benefit.
In Context
How It Compares
The balanced 10-10-10 approach is ideal for deciduous shrubs because they need support across all growth phases — unlike evergreens that maintain foliage year-round. Compared to the evergreen formula, this lacks the iron supplement since deciduous shrubs rarely suffer iron chlorosis.
Answers
Frequently Asked Questions
What is the best fertilizer for deciduous shrubs?
A balanced 10-10-10 fertilizer is an excellent choice for deciduous shrubs because it supports all phases of seasonal growth — spring bud break, summer flowering and foliage development, and fall energy storage. Nitrogen promotes lush green leaves and strong stems, phosphorus supports root depth and flower bud formation, and potassium enhances disease resistance and winter hardiness. This balanced approach works across a wide variety of flowering and foliage shrubs. Old Cobblers Farm™ Wicked Growth Deciduous Shrubs Fertilizer 10-10-10 provides the complete, balanced nutrition deciduous shrubs need to thrive from spring through fall.
When should I fertilize hydrangeas?
Fertilize hydrangeas in early spring when new growth emerges and again in early summer to support flowering. Panicle, smooth, and oakleaf hydrangeas bloom on new wood and benefit from spring feeding that fuels flower-producing stems. Bigleaf hydrangeas (mopheads and lacecaps) bloom on old wood and should be fed lightly after flowering. Stop fertilizing all hydrangeas by mid-summer to allow plants to harden off before winter. Old Cobblers Farm™ Wicked Growth Deciduous Shrubs Fertilizer 10-10-10 delivers balanced nutrition that supports lush foliage and abundant blooms across all hydrangea types.
How do I fertilize lilacs and forsythia?
Lilacs and forsythia are moderate feeders that respond well to a balanced 10-10-10 fertilizer applied in early spring before growth begins. Apply ½–1 cup per small shrub or 2–3 cups for large, established specimens, spreading evenly around the drip line. A second lighter application after flowering helps replenish nutrients and supports healthy foliage for the rest of the season. Avoid late-season fertilizing. Water deeply after each application. Old Cobblers Farm™ Wicked Growth Deciduous Shrubs Fertilizer 10-10-10 promotes vigorous spring flowering and healthy seasonal growth in lilacs, forsythia, and other popular deciduous shrubs.
How much fertilizer do shrubs need?
For deciduous shrubs, apply ½ cup of 10-10-10 per small shrub, 1 cup per medium shrub, and 2–3 cups per large established shrub. Spread fertilizer evenly around the drip line, avoiding contact with trunks or stems. Lightly work into the top inch of soil and water deeply. Apply every 6–8 weeks from early spring through mid-summer, then stop to let plants prepare for dormancy. Adjust rates based on soil test results and plant response. Old Cobblers Farm™ Wicked Growth Deciduous Shrubs Fertilizer 10-10-10 is easy to measure and apply for beautiful, healthy shrubs.
Can I use 10-10-10 on flowering shrubs?
Yes, 10-10-10 is well-suited for flowering deciduous shrubs including lilacs, forsythia, spirea, hydrangeas, rose of Sharon, weigela, beautyberry, mock orange, and viburnum. The balanced formula supports leaf and stem growth, flower bud formation, root health, and overall plant vigor. For shrubs that are primarily grown for flowers, you can supplement with a higher-phosphorus fertilizer during bloom season for even more impressive flower displays. Old Cobblers Farm™ Wicked Growth Deciduous Shrubs Fertilizer 10-10-10 provides versatile, reliable nutrition for all types of flowering deciduous shrubs.
When should I stop fertilizing shrubs in fall?
Stop fertilizing deciduous shrubs by mid-summer (late July to early August in most northern climates). Continuing to feed later encourages tender new growth that will not have time to harden off before winter, making it susceptible to frost damage. Shrubs need several weeks of declining day length and nutrient availability to naturally enter dormancy. An early spring application and one mid-summer feeding are typically sufficient for most deciduous shrubs. Old Cobblers Farm™ Wicked Growth Deciduous Shrubs Fertilizer 10-10-10 is designed for a spring-through-midsummer feeding schedule that respects natural dormancy cycles.
What shrubs need the most fertilizer?
The heaviest-feeding deciduous shrubs include hydrangeas, roses of Sharon, butterfly bushes, and spirea — all of which produce abundant flowers on vigorous new growth each season. Moderate feeders include lilacs, viburnums, forsythia, and dogwood shrubs. Light feeders like ninebark and chokeberry need minimal supplementation. Match your fertilizer schedule to the plant's growth habit — heavy feeders benefit from applications every 6 weeks, while light feeders may only need one spring application. Old Cobblers Farm™ Wicked Growth Deciduous Shrubs Fertilizer 10-10-10 works well across the full spectrum of deciduous shrub types.
