What Can I Put on My Shrubs to Make Them Grow Faster? Expert Tips and Solutions

Growing lush, healthy shrubs is a rewarding experience for any homeowner or gardener. Whether you’re using them for privacy, aesthetics, or to enhance curb appeal, fast-growing shrubs can transform your landscape in no time. But what exactly can you put on your shrubs to encourage rapid and robust growth? The answer lies in understanding your shrubs’ needs and using the right combination of nutrients, mulch, soil conditioners, and care techniques.

In this comprehensive guide, we’ll explore scientifically backed and expert-approved methods to accelerate shrub growth. From fertilizers and organic amendments to proper watering practices and pruning strategies, you’ll learn everything you need to make your shrubs flourish—naturally and efficiently.

Understanding What Affects Shrub Growth

Before diving into growth-enhancing methods, it’s important to understand the natural factors that influence how quickly your shrubs grow. These include:

• Soil quality – Nutrient content, pH level, and drainage affect root development.
• Sunlight exposure – Most shrubs need at least 6 hours of sunlight daily.
• Water availability – Consistent moisture supports metabolic functions.
• Climate and seasonality – Shrubs grow best in their ideal temperature and humidity ranges.
• Plant variety – Some shrubs are genetically predisposed to grow faster than others.

While you can’t change the genetics of your shrubs or control the weather completely, you can dramatically improve their immediate environment—the foundation of faster growth.

Best Natural and Organic Additives for Faster Shrub Growth

One of the safest and most effective ways to speed up shrub growth is using natural and organic materials. These improve soil fertility, encourage microbial life, and promote long-term root health.

Compost: The Gold Standard for Shrub Nutrition

Compost is one of the most beneficial substances you can apply to shrubs. It’s rich in essential nutrients like nitrogen, phosphorus, and potassium—known collectively as NPK. These are critical for leaf development, root strength, and flowering.

1. Spread a 2- to 3-inch layer of compost around the base of your shrubs annually.
2. Mix it gently into the top layer of soil to avoid damaging roots.
3. Use aged compost, not fresh, to avoid burning plant roots.

Compost also improves soil structure, increasing water retention in sandy soils and enhancing drainage in clay soils.

Organic Mulch: Insulation and Nutrient Supply Combined

Applying organic mulch around your shrubs offers multiple benefits. Materials like wood chips, shredded bark, leaf mold, or straw:

• Reduce moisture evaporation, keeping roots consistently hydrated.
• Suppress weeds that compete for nutrients and sunlight.
• Gradually decompose, enriching the soil with organic matter.
• Regulate soil temperature, protecting roots from extreme heat and cold.

For optimal use:

• Apply a 3- to 4-inch layer around the shrub’s base.
• Keep mulch several inches away from the trunk to prevent rot and pests.
• Replenish annually as the mulch decomposes.

Tip: Avoid using rubber or plastic mulches around shrubs—they don’t enhance soil health and can trap heat.

Compost Tea: A Liquid Boost for Root and Leaf Growth

Compost tea is a nutrient-rich liquid made by steeping compost in water. It contains beneficial microbes and dissolved nutrients that are rapidly absorbed by shrub roots.

To make compost tea:

• Place a bucket of aged compost inside a burlap sack or porous bag.
• Soak it in 5 gallons of water for 3–5 days, stirring occasionally.
• Strain and dilute the liquid (1:10 ratio with water) before applying.

Apply compost tea as a soil drench every 4–6 weeks during the growing season. It’s especially effective for stressed or young shrubs needing a growth jumpstart.

Top Fertilizers That Speed Up Shrub Growth

Fertilizers provide concentrated nutrients that address deficiencies and fuel growth. Choosing the right kind—and applying it properly—makes a big difference.

Understanding NPK Ratios

Fertilizer packages list NPK values, which indicate the percentage of nitrogen (N), phosphorus (P), and potassium (K). Here’s how each affects shrubs:

Slow-Release Granular Fertilizers

These are ideal for sustained nutrient delivery. Typically applied in early spring and mid-summer, slow-release fertilizers prevent nutrient leaching and ensure steady growth.

Look for:

• Shrub-specific formulas (e.g., “Shrub & Tree Fertilizer”)
• An NPK ratio balanced for your shrub type, such as 18-6-12 for general use

Apply according to package instructions. Over-fertilizing can cause root burn or excessive leafy growth at the expense of flowers.

Water-Soluble Fertilizers: Quick Absorption

For immediate results, water-soluble fertilizers dissolve in water and are absorbed by roots within hours. They’re useful when:

• You notice signs of nutrient deficiency (e.g., yellow leaves)
• Your shrub is newly transplanted
• It’s been a long time since the last feeding

Popular options include Miracle-Gro Shake ‘n Feed or Jobe’s Organic Liquid Fertilizer. Apply every 2–4 weeks during active growth, usually spring through early fall.

Organic vs. Synthetic Fertilizers: Which is Better?

The debate between organic and synthetic fertilizers often comes down to sustainability and speed.

Organic fertilizers, such as fish emulsion, bone meal, or blood meal, release nutrients slowly and improve soil health. They’re safer for the environment and reduce the risk of over-application.

Synthetic fertilizers act faster but can harm soil microbes and leach into groundwater. Use them sparingly and only when quick correction is needed.

For long-term shrub vitality, prioritize organic sources while using synthetics as short-term supplements.

Soil Amendments for Enhanced Root Development

The foundation of fast shrub growth begins beneath the surface. Healthy roots absorb nutrients efficiently, supporting vigorous top growth.

Mychorrhizal Fungi: Nature’s Root Boosters

Mycorrhizal fungi form symbiotic relationships with plant roots. They extend the root system’s reach, increasing water and nutrient absorption—especially phosphorus.

To use:

• Apply mycorrhizal inoculant during planting or when reviving struggling shrubs.
• Choose products labeled for shrubs and trees, like MycoBoost or Xtreme Gardening Mykos.

This is a one-time treatment for the most part, as the fungi establish long-lasting colonies.

Lime and Sulfur: Adjusting Soil pH

Shrubs grow best in soil with a pH between 5.5 and 6.5, though some (like azaleas) prefer more acidity. If your soil is too alkaline or acidic, nutrients become unavailable to plants.

Use:

• Lime to raise pH in acidic soils (common in rainy climates)
• Sulfur to lower pH in alkaline soils (common in arid regions)

Test your soil with a home pH kit before adding amendments. Overcorrection can harm shrubs.

Gypsum: Improving Soil Structure Without Changing pH

Gypsum (calcium sulfate) is excellent for breaking up compact clay soil. Unlike lime, it doesn’t alter pH but helps:

• Loosen soil for better root penetration
• Add essential calcium and sulfur
• Promote drainage in heavy soils

Apply 20–30 pounds per 100 square feet and water deeply. It takes a few weeks to fully dissolve and act.

Essential Care Practices That Accelerate Growth

Beyond what you put on your shrubs, how you care for them determines their growth rate.

Proper Watering Techniques

Consistent moisture is vital, especially during the first year after planting. Underwatering causes stress, while overwatering leads to root rot.

Best watering practices:

• Water deeply but infrequently—encourage roots to grow downward.
• Morning watering reduces evaporation and fungal risks.
• Use soaker hoses or drip irrigation to deliver water directly to roots.

A general rule: Shrubs need 1–2 inches of water per week, including rainfall. During dry spells, increase frequency.

Pruning for Vigorous Growth

Strategic pruning removes dead or crowded branches, allowing healthy growth. It also stimulates new shoots, which is essential for density and shape.

Timing matters:

• Prune spring-flowering shrubs (like forsythia) right after blooming.
• Prune summer- and fall-flowering shrubs (like butterfly bush) in late winter or early spring.

Always use clean, sharp tools. Remove no more than one-third of the plant’s growth at a time.

Tip: Heading vs. Thinning Cuts

Heading cuts involve trimming the tips of branches to encourage bushier growth. This is ideal for hedges.

Thinning cuts remove entire branches back to the base, improving airflow and reducing density. Use this for health maintenance.

Combining both techniques creates full, healthy shrubs.

Regular Monitoring and Pest Management

Pests like aphids, spider mites, and scale insects drain energy from shrubs, slowing growth. Signs include spotted leaves, stunted shoots, or sticky residue (honeydew).

Act immediately with:

• Insecticidal soap or neem oil (organic options)
• Hosing down leaves to dislodge pests
• Encouraging beneficial insects like ladybugs

Diseases such as powdery mildew or root rot also hinder growth. Ensure good air circulation and avoid wetting foliage when watering.

Choosing Fast-Growing Shrubs for Quick Results

While you can boost the growth of most shrubs, selecting naturally fast-growing varieties gives you a head start.

Here are several of the fastest-growing shrubs suitable for various climates:

Pairing these varieties with the growth-boosting methods outlined above leads to dramatic landscape transformation within a single season.

Timing and Seasonal Application Strategies

The timing of your inputs is just as crucial as the materials you use.

Spring: The Prime Growth Season

Spring is when shrubs emerge from dormancy and begin active growth. This is the best time to:

• Apply balanced fertilizer (e.g., 10-10-10)
• Add fresh compost or mulch
• Prune winter-damaged branches
• Inoculate soils with mycorrhizae if planting new shrubs

Begin applications in early spring, just as new buds appear.

Summer: Support Through the Heat

During high temperatures, shrubs experience growth stress. Continue watering regularly and apply water-soluble fertilizer every 4–6 weeks if needed.

Avoid heavy fertilization in late summer, as this can promote tender new growth vulnerable to frost.

Fall: Prepare for Winter and Next Year

Fall fertilization with a low-nitrogen, high-potassium blend (e.g., 5-10-10) helps shrubs harden off before winter. This supports root strength without encouraging leafy growth.

Late fall is also ideal for:

• Adding compost to improve soil over winter
• Top-dressing with mulch for insulation
• Conducting soil tests to plan spring amendments

Winter: Dormant Care and Protection

While shrubs grow slowly in winter, protect their health by:

• Removing heavy snow from branches to prevent breakage
• Inspecting for pests and diseases
• Staking young shrubs in windy areas

Avoid fertilizing in winter—plants won’t absorb nutrients, and runoff can pollute waterways.

Common Mistakes That Slow Shrub Growth

Even with the best intentions, some common gardening practices can hinder shrub development.

Overfertilizing

Too much fertilizer causes “fertilizer burn,” where salts accumulate in the soil and damage roots. Symptoms include brown leaf edges and stunted growth.

Solution: Always follow package instructions and conduct soil tests before fertilizing.

Mulch Volcanoes

Piling mulch directly against the shrub trunk traps moisture, encouraging rot, pests, and fungal infections.

Solution: Keep mulch 3–6 inches away from the trunk and maintain a flat, donut-shaped layer.

Improper Pruning

Pruning at the wrong time or too aggressively can delay flowering and reduce growth.

Solution: Research your shrub’s flowering cycle and prune accordingly. Always use sterilized tools.

Neglecting Soil Health

Focusing only on top growth while ignoring root environment is a recipe for poor results.

Solution: Prioritize soil testing, organic matter, and microbial health alongside surface treatments.

Conclusion: Optimize for Speed, Health, and Long-Term Beauty

Making your shrubs grow faster is not about quick fixes—it’s about creating consistent, supportive conditions. The most effective strategies combine quality soil amendments, proper fertilization, thoughtful watering, and seasonal care.

By applying compost, organic mulch, and the right fertilizers—and pairing them with proper pruning and pest control—you can expect to see noticeable improvements in growth rate, density, and overall health within weeks.

The key takeaway is this: healthy shrubs grow fast naturally. Your role as a gardener is to remove obstacles and provide ideal conditions. Whether you’re using slow-release organic fertilizers or kickstarting growth with compost tea, your efforts will pay off in thriving greenery.

So go ahead—feed your soil, nourish your roots, and watch your shrubs surge with vitality. With the right inputs and care, you’ll enjoy a lush, fast-growing landscape that enhances your home for years to come.

What type of fertilizer is best for encouraging faster shrub growth?

Choosing the right fertilizer is crucial for promoting rapid and healthy shrub growth. A balanced fertilizer with equal parts nitrogen (N), phosphorus (P), and potassium (K)—such as a 10-10-10 or 14-14-14 formula—is generally ideal for most shrubs during the growing season. Nitrogen supports lush green foliage, phosphorus strengthens root development, and potassium enhances overall plant health and disease resistance. Slow-release granular fertilizers are often recommended because they provide a steady supply of nutrients over time, reducing the risk of over-fertilization.

The timing and application method are just as important as the fertilizer choice. Apply fertilizer in early spring as new growth begins, and consider a second application in early summer if needed. Avoid fertilizing late in the season, as this can stimulate new growth that may not harden off before winter. Always follow the manufacturer’s instructions for dosage and spread the fertilizer evenly around the drip line (the outer edge of the canopy), where the feeder roots are most active. Water thoroughly after application to help nutrients reach the root zone.

How does soil quality affect shrub growth, and how can I improve it?

Soil quality directly influences shrub health and growth speed. Well-draining soil rich in organic matter provides the optimal environment for root development, nutrient uptake, and water retention. Poor soil—whether too sandy, clay-heavy, or compacted—can restrict root expansion and oxygen flow, ultimately stunting growth. Conducting a soil test is an essential first step, as it reveals pH levels and nutrient deficiencies that can be corrected based on your shrubs’ specific needs.

To improve soil quality, incorporate organic amendments such as compost, well-rotted manure, or leaf mold. These enhance soil structure, increase microbial activity, and slowly release nutrients. For heavy clay soils, adding compost improves drainage, while sandy soils benefit from organic matter that boosts water and nutrient retention. Mulching around the base of shrubs also helps maintain moisture and gradually enriches the soil as the mulch breaks down. Over time, these improvements create a fertile, aerated environment where shrubs can thrive and grow faster.

Can mulching help my shrubs grow faster, and if so, which mulch is best?

Yes, mulching significantly contributes to faster shrub growth by conserving soil moisture, regulating soil temperature, and suppressing weeds that compete for nutrients. A proper layer of mulch—typically 2 to 4 inches thick—helps create a stable root environment, reducing stress on shrubs during temperature extremes or drought conditions. As organic mulches decompose, they also enrich the soil with nutrients and improve its texture, further supporting vigorous growth.

The best mulches for encouraging shrub growth are organic options such as shredded bark, wood chips, pine straw, or composted leaves. These materials break down over time and enhance soil fertility. Avoid piling mulch against the shrub’s trunk, as this can trap moisture and promote rot or pest infestations—leave a few inches of space around the base. Replenish mulch annually as needed to maintain its effectiveness. For decorative appeal and long-term benefits, hardwood mulch or composted yard waste are excellent choices.

How often should I water my shrubs to promote faster growth?

Consistent and deep watering is essential to encourage rapid shrub growth, especially during the first year after planting or during dry periods. Instead of frequent shallow watering, aim to water deeply once or twice a week, allowing moisture to penetrate 6 to 12 inches into the soil. This promotes deeper root development, making shrubs more resilient and better equipped to absorb nutrients efficiently, which supports faster and more sustainable growth.

The exact watering frequency depends on climate, soil type, and shrub species. In hot or windy weather, shrubs may need more frequent watering, while clay soils retain moisture longer than sandy soils. Using a soaker hose or drip irrigation system ensures water reaches the root zone without waste. Always check soil moisture before watering—stick your finger 2 inches into the ground near the roots; if it’s dry, it’s time to water. Overwatering can lead to root rot and inhibit growth, so balance is key.

Are there any natural growth boosters I can use on my shrubs?

Yes, several natural growth boosters can enhance shrub development without the use of synthetic chemicals. Compost tea, for example, is a nutrient-rich liquid made by steeping compost in water, and it delivers beneficial microbes and trace nutrients directly to the roots when used as a soil drench. Fish emulsion and seaweed extract are other organic options rich in nitrogen, potassium, and micronutrients that stimulate leaf and root growth while improving plant resilience.

These natural boosters work best when applied every few weeks during the growing season. They promote healthy microbial activity in the soil and support gradual, sustainable growth. Unlike chemical fertilizers that can burn roots if over-applied, natural boosters are gentler and less likely to cause harm. For optimal results, combine their use with proper watering, mulching, and sunlight exposure to create a holistic environment where shrubs can grow faster and stronger over time.

How important is sunlight for the growth rate of shrubs?

Sunlight is one of the most critical factors influencing shrub growth speed and overall health. Most shrubs require at least 6 hours of direct sunlight daily to photosynthesize efficiently, producing the energy needed for leaf, stem, and root development. Insufficient light can lead to leggy growth, reduced flowering, and weaker plants that are more susceptible to pests and diseases. Always check the sunlight requirements of your specific shrub variety when selecting a planting location.

If your shrubs are not receiving enough sunlight, consider pruning nearby trees to allow more light penetration or relocating shade-tolerant shrubs under dense canopies. Some shrubs, like azaleas or rhododendrons, thrive in partial shade, while others such as butterfly bushes and potentillas require full sun. Matching your shrubs to their ideal light conditions ensures optimal growth. Reflective surfaces or lighter-colored mulches can also help redirect more sunlight to lower foliage, enhancing overall vigor.

What pruning techniques encourage faster shrub growth?

Pruning at the right time and in the proper manner can actually stimulate faster and healthier shrub growth. Light, strategic pruning removes dead, damaged, or crossing branches and improves air circulation and light penetration within the canopy. This reduces disease risk and allows the plant to direct energy toward new, vigorous growth. For most deciduous shrubs, late winter or early spring pruning just before new growth begins is ideal, as it encourages strong shoots during the upcoming growing season.

Avoid heavy pruning or shearing unless necessary, as excessive cutting can stress the plant and delay growth. Instead, use thinning cuts—removing entire branches at their base—to maintain the shrub’s natural shape and promote outward growth. For flowering shrubs, timing is crucial: spring bloomers should be pruned after flowering, while summer bloomers can be pruned in late winter. Regular light pruning not only enhances aesthetics but also keeps shrubs productive, healthy, and growing at an optimal pace.