The Complete Fertiliser Guide: Matching the Right Product to Every Garden Problem

Are your tomatoes failing to fruit? Flowers lacking vibrant colour? Vegetable yields disappointing year after year? The solution may be simpler than you think: selecting the right fertiliser for each stage of plant growth.

In this comprehensive guide, we’ll show you exactly how our premium fertiliser range — specialised NPK blends, professional-grade MKP, Calcium Nitrate, fast-acting Iron Chelate, soil-transforming Humic Acid, organic Guano, Kelp Seaweed, and Urea — can solve your most frustrating garden problems.

⚠️ Note: Application rates mentioned throughout this guide are general starting points and vary by plant, soil, and growing conditions. For a more detailed dosage per plant and in different conditions, please use our Smart Fertigation Planner.

Our Professional-Grade Fertiliser Collection: The Perfect Solution for Every Plant Need

1. Premium MKP (Monopotassium Phosphate): The Ultimate Flowering & Fruiting Formula

Our highly soluble MKP delivers concentrated phosphorus and potassium to trigger explosive flowering and maximise fruit production in all your garden favourites.

Why Gardeners Love Our MKP:

• • ●Bigger, More Abundant Blooms: The high phosphorus content stimulates flower bud formation, increasing bloom count by up to 40%.
  • ●Heavier Fruit Production: Potassium strengthens fruiting capacity, resulting in larger, more flavourful harvests.
  • ●Stronger Root Systems: Promotes extensive root development, helping plants access more soil nutrients and water.
  • ●Stress Resistance: Improves plant tolerance to drought, heat, and disease pressure.

Perfect For:

• • ●Tomatoes, peppers, and strawberries during flowering and fruiting
  • ●Rose bushes and flowering perennials from bud set through bloom
  • ●Cannabis and hemp during transition to flowering stage
  • ●Any plant showing signs of phosphorus deficiency (purple stems or stunted growth)

Application Guide:

• • ●Water-Soluble Convenience: Dissolves completely in water for irrigation or foliar feeding.
  • ●Fast Results: Visible improvements in plant vigour within 7–14 days.
  • ●Economical Use Rate: About 10 grams per litre for foliar application.

🛒 Shop Premium MKP Fertiliser — Boost Flowering & Fruiting Today!

2. Specialised NPK Formulations: Targeted Nutrition for Every Growth Stage

Our professional-grade NPK fertilisers are precisely formulated to match specific plant needs throughout the growing season. Each blend in our collection serves a distinct purpose in your garden’s success.

NPK 20-20-20: The Complete Balanced Growth Formula

The Perfect All-Purpose Solution:

• • ●Balanced nutrition for continuous, healthy growth in all plant types
  • ●High nitrogen content promotes lush, green foliage
  • ●Equal phosphorus supports strong root development
  • ●Matching potassium ensures overall plant health and stress resistance

Ideal Applications:

• • ●Vegetable gardens during active growth phases
  • ●Lawns throughout the growing season
  • ●Houseplants needing regular feeding
  • ●New transplants requiring establishment support

🛒 Shop 20-20-20 Complete Plant Food

NPK 10-52-10: The Root Development & Flowering Booster

Why It’s Essential:

• • ●Super-charged phosphorus concentration for explosive root growth
  • ●Significantly increases flower bud formation
  • ●Supports transplant recovery and establishment
  • ●Ideal for phosphorus-loving plants and phosphorus-deficient soils

Best Used For:

• • ●Bulbs and perennials during planting and early spring growth
  • ●Tomatoes and peppers at transplant time
  • ●Root crops like carrots, radishes, and onions
  • ●Starter fertiliser for trees and shrubs

🛒 Shop 10-52-10 Root & Bloom Formula

NPK 12-12-36: The Fruit, Flower & Stress Protection Formula

The Potassium Powerhouse:

• • ●Triple potassium strength for maximum fruit development
  • ●Enhances flower colour intensity and longevity
  • ●Strengthens cell walls for better disease resistance
  • ●Improves water regulation during hot, dry conditions

Perfect Timing:

• • ●Late-season feeding for all fruiting plants
  • ●Summer application during heat stress periods
  • ●Pre-harvest treatment for sweeter, larger fruits
  • ●Winter preparation for trees and perennials

🛒 Shop 12-12-36 Fruit & Finish Formula

3. Calcium Nitrate: The Blossom End Rot & Calcium Deficiency Solution

Our Calcium Nitrate delivers nitrate nitrogen and calcium together in one fast-acting, fully water-soluble feed — exactly what’s needed to stop fruit and leaf disorders before they start.

Why Gardeners Rely On It:

• • ●Stronger Cell Walls: Calcium strengthens plant tissue, making fruit and leaves more resistant to disease and damage.
  • ●Prevents Blossom End Rot & Tip Burn: A steady calcium supply is the best defence against these common disorders.
  • ●Quick-Acting Nitrogen: Nitrate nitrogen is immediately available with no risk of ammonium buildup.
  • ●Better Fruit Quality: Improves firmness and shelf life in fruiting crops.

Perfect For:

• • ●Tomatoes, peppers, cucumbers, strawberries, and melons
  • ●Leafy greens prone to tip burn
  • ●Greenhouse and hydroponic systems needing precise nutrient control
  • ●Heavy-fruiting crops prone to cracking

Application Guide:

• • ●Fully Water-Soluble: Suits soil drenching, foliar spraying, or fertigation.
  • ●Best Timing: Apply during fruiting stages for maximum blossom-end-rot protection.
  • ●Tank-Mix Tip: Keep separate from sulfate or phosphate fertilisers in concentrated mixes to avoid precipitation.

🛒 Shop Calcium Nitrate — Stop Blossom End Rot Today!

4. Fast-Acting Iron Chelate: The Yellowing Leaf Solution

Our Iron Chelate powder is fully soluble and delivers readily available iron that plants can immediately absorb, even in challenging soil conditions. Watch yellow leaves transform to rich, deep green within days.

The Yellow Leaf Rescue Formula:

• • ●Rapid Greening: Corrects chlorosis (yellowing between leaf veins) within 5–7 days.
  • ●Long-Lasting Protection: Prevents new chlorosis for up to 3–4 months per application.
  • ●pH-Tolerant Formula: Remains available even in high-pH soils where other iron sources fail.
  • ●Complete Absorption: Specially chelated form prevents iron lockout in soil.

Critical For:

• • ●Acid-loving plants like azaleas, rhododendrons, and blueberries
  • ●Lawns developing yellow patches despite adequate nitrogen
  • ●Container plants showing iron deficiency symptoms
  • ●Gardens with alkaline soil (pH above 7.0)

Pro Application Tips:

• • ●Apply at first sign of yellowing for fastest recovery.
  • ●Preventative spring application helps avoid summer chlorosis.
  • ●Particularly effective when combined with our Humic Acid for enhanced uptake.

🛒 Shop Premium Iron Chelate — Bring Back the Green!

5. Professional-Grade Humic Acid Powder: The Garden Performance Amplifier

Our concentrated Humic Acid is a fully soluble powder that improves soil structure while enhancing the performance of every other fertiliser you apply. It’s the secret ingredient professional growers rely on for maximum yields.

The Soil Transformation Formula:

• • ●Nutrient Magnifier: Increases the efficiency of all other fertilisers by 30–60%.
  • ●Microbial Activator: Stimulates beneficial soil organisms that support plant health.
  • ●Clay Soil Improver: Breaks up compacted soils for better root penetration.
  • ●Sandy Soil Enhancer: Improves water retention and reduces nutrient leaching.
  • ●CEC Booster: Increases soil’s capacity to hold and exchange nutrients.

Garden Game-Changer For:

• • ●New garden beds needing soil improvement
  • ●Raised beds with depleted soil structure
  • ●Container gardens where soil volume is limited
  • ●Lawns suffering from compaction or poor drainage
  • ●Any garden seeking to reduce overall fertiliser usage

Application Strategy:

• • ●Regular Use Benefit: Apply monthly during growing season for progressive soil improvement.
  • ●One-Time Rescue: Immediate relief for stressed plants and poor-performing gardens.
  • ●Synergistic Effect: Combine with our NPK blends, MKP, or Iron Chelate for enhanced results.

🛒 Shop Professional Humic Acid — Unlock Your Soil’s Full Potential!

6. Organic Guano: The Long-Term Phosphorus & Calcium Builder

Our fossilised seabird Guano is a genuinely organic, slow-release source of phosphorus and calcium — a soil investment for gardeners who think in seasons rather than weeks.

Why It Belongs in an Organic Program:

• • ●Naturally Multi-Nutrient: Phosphorus, calcium, and magnesium in one product — no acid treatment, no synthetic additives.
  • ●Low Burn Risk: Slow mineral release means it’s far more forgiving than fast-acting synthetics.
  • ●Builds Soil Over Time: Improves fertility season after season rather than feeding just one crop cycle.
  • ●Fits Low-Input Growing: Simply mined, dried, and ground — a genuine organic origin product.

Perfect For:

• • ●New garden beds and raised beds before planting
  • ●Tomatoes, capsicums, root vegetables, and roses
  • ●Citrus and fruit trees needing long-term vigour
  • ●Gardeners wanting a genuinely organic, animal-derived input

Application Guide:

• • ●Best Timing: Work into soil ahead of planting — autumn or winter incorporation gives it a head start.
  • ●Water It In: Helps settle it into the soil and begin the breakdown process.
  • ●Pair It Up: A long-term soil builder, not a quick fix — combine with Urea or a blood-and-bone style product if plants need fast nitrogen too.

🛒 Shop Organic Guano — Build Your Soil for the Long Term!

7. Kelp Seaweed: The Natural Growth & Stress-Resilience Booster

Our Kelp Seaweed is a natural biostimulant rather than a primary N-P-K feed — it works alongside your regular fertiliser program to help plants cope with stress and establish faster.

Why Growers Add It to Their Program:

• • ●Natural Growth Compounds: Contains naturally occurring plant growth stimulants that support cell division and root branching.
  • ●Trace Mineral Boost: Broad-spectrum micronutrients often missing from standard NPK blends.
  • ●Stress Resilience: Helps plants cope with heat, drought, frost, and transplant shock.
  • ●Gentle Formula: Well suited to seedlings and sensitive young plants.

Perfect For:

• • ●Seedlings and new transplants settling in
  • ●Plants recovering from heat, frost, or drought stress
  • ●A foliar tonic between regular feeding rounds
  • ●Organic and sustainable growing systems

Application Guide:

• • ●Typically diluted and applied as a soil drench or foliar spray.
  • ●Check your product label for exact mixing rates, since concentration varies between liquid and powder kelp products.
  • ●Pairs well with Humic Acid for a complete soil-and-plant health program.

🛒 Shop Kelp Seaweed — Give Your Plants a Natural Edge!

8. Urea: Fast-Acting Nitrogen for Rapid Green-Up

Our Urea is one of the most concentrated nitrogen sources available, at around 46% nitrogen — the fastest way to push leafy, green growth when your plants need it most.

Why Growers Keep It on Hand:

• • ●Highest Nitrogen Concentration: Around 46% N — more nitrogen per bag than almost any other fertiliser.
  • ●Fully Soluble: Fast uptake through soil or foliar application.
  • ●Cost-Effective: An economical way to deliver nitrogen at scale.
  • ●Versatile: Works across lawns, field crops, and leafy vegetables.

Perfect For:

• • ●Lawns needing a fast green-up
  • ●Leafy vegetables and heavy nitrogen feeders like corn and brassicas
  • ●Early vegetative growth stages, before flowering begins
  • ●Topping up nitrogen between balanced NPK feeds

Application Guide:

• • ●Water-soluble for irrigation, fertigation, or foliar use.
  • ●Because of its concentration, apply conservatively and always water in to avoid leaf or root burn.
  • ●Not recommended during flowering or fruiting, when excess nitrogen can delay bloom.

🛒 Shop Urea — Fast Nitrogen When You Need It!

Problem-Solving Guide: Match Your Garden Challenge to Our Perfect Solution

Table Choose Fertiliser

Seasonal Fertiliser Calendar: The Perfect Program for Year-Round Success

Follow our proven fertiliser program to maximise your garden results through every season:

Early Spring (Awakening Phase)

• • ●Base Application: NPK 20-20-20 for all garden beds to jumpstart growth.
  • ●Root Booster: NPK 10-52-10 for perennials emerging from dormancy.
  • ●Soil Prep: Humic Acid and Guano incorporated throughout the garden for season-long benefits.
  • ●Prevention: Iron Chelate for acid-loving plants before symptoms appear.
  • ●Fast Start: Urea for lawns that need a quick nitrogen kickstart.

Late Spring (Growth Phase)

• • ●Vegetative Support: Continue NPK 20-20-20 for leafy vegetables and general feeding.
  • ●Bloom Initiation: Begin MKP applications for early-season flowering plants.
  • ●Transplant Support: Kelp Seaweed for new transplants settling into the garden.
  • ●Maintenance: Second Humic Acid application to enhance nutrient availability.
  • ●Correction: Spot-treat any yellowing plants with Iron Chelate.

Early Summer (Production Phase)

• • ●Fruiting Support: Transition to NPK 12-12-36 for developing fruits and vegetables.
  • ●Bloom Maximiser: Increase MKP application frequency for continuous flowering plants.
  • ●Disorder Prevention: Calcium Nitrate to guard against blossom end rot as fruit sets.
  • ●Heat Protection: Additional Humic Acid application, plus Kelp Seaweed to help plants cope with heat stress.
  • ●Maintenance: Foliar feed with NPK 20-20-20 for green leafy crops.

Late Summer / Early Fall (Harvest & Preparation Phase)

• • ●Fruit Finisher: Final NPK 12-12-36 application to maximise harvest quality.
  • ●Fall Flowers: MKP application for fall-blooming perennials.
  • ●Winter Prep: NPK 10-52-10 and Guano for root development and soil building before dormancy.
  • ●Season Extension: Iron Chelate application to maintain green growth into fall.
  • ●Lawn Top-Up: A final light Urea feed for cool-season lawns before growth slows.

Why Our Fertiliser Collection Stands Above the Rest

• • ●Professional-Grade Quality: The same commercial formulations used by professional growers and landscapers.
  • ●Highly Soluble Formulations: Complete dissolution for maximum availability and no clogged equipment.
  • ●Scientifically Balanced Ratios: Precisely calculated nutrient proportions for specific plant responses.
  • ●Greenhouse Tested: Proven performance in controlled studies before reaching your garden.
  • ●Satisfaction Guaranteed: 100% results or your money back.

Get Started Today: Your Complete Fertiliser Solution

Transform your garden with our professional-grade fertiliser collection. Whether you’re growing prize-winning roses, seeking the perfect lawn, or maximising your vegetable harvest, we have the exact formulation you need for success.

🛒 Shop Our Complete Fertiliser Collection

Need personalised recommendations? Contact our garden experts at info@greenpick.com.au for custom advice based on your specific plants and growing conditions.