Why Indoor Fertilizers Are Essential

Indoor plants rely entirely on us for their nutrition because potted soil depletes quickly and lacks natural replenishment. Over time, watering and plant growth remove essential nutrients like nitrogen, phosphorus, and potassium, leaving your plants vulnerable to slow growth and pale, weak foliage. Indoor fertilizers are the key to replenishing these nutrients, helping your houseplants thrive with strong roots, vibrant leaves, and healthy blooms.

Whether you’re caring for tropical foliage, flowering orchids, or resilient succulents, understanding the basics of indoor plant fertilizers can transform your houseplants from surviving to thriving.

Below, we’ll break down the most common types of indoor houseplant fertilizers, how they benefit your plants, and how to use them effectively for stronger roots, greener leaves, and better growth.

Bios Plant Probiotic

• Looking for a more holistic way to feed your houseplants? Bios Nutrients Plant Probiotic is a natural probiotic for plants that supports soil health, improves nutrient absorption, and protects against common plant diseases—making it an excellent supplement or alternative to traditional fertilizers.

  Just like our gut needs good bacteria to thrive, plants benefit from beneficial microbes that break down nutrients, protect roots from disease, and help create a healthier growing environment. This probiotic is safe for indoor houseplants, edible herbs, vegetables, and even lawns—and it’s 100% organic and pet-friendly.

   Key Benefits:

  • Helps control powdery mildew and fungal diseases naturally

  • Improves water retention and root hydration

  • Boosts nutrient uptake for stronger, faster plant growth

  • Supports terpene production in flowering and fruiting plants

  • Easy to use: Mix 1ml per litre/quart and apply via watering can or spray bottle

  • Works well alongside other organic fertilizers (not recommended with synthetics)

  This microbe-rich formula includes water, molasses, herbal extracts (like chamomile, dandelion, and valerian root), and a proprietary blend of beneficial bacteria and fungi (such as Lactobacillus, Bifidobacterium, and Streptococcus strains).

  To enhance foliar application, pair it with Bios Yucca Extract for better spray coverage and moisture absorption—especially helpful for tropical plants and dry indoor air environments.

Bios All-Natural Plant Fertilizer

• Bios Natural Plant Fertilizer is a 100% organic, probiotic fertilizer made through natural fermentation. Designed to mimic how plants have nourished themselves in nature for millions of years, this formula contains billions of beneficial bacteria and fungi that work around the clock to boost root health, improve nutrient absorption, and protect against pests and disease—all while being completely safe for pets and pollinators.

  Packaged in a fully home-compostable bag, Bios is an eco-friendly option for conscious plant lovers and gardeners who want lush, resilient plants without the use of synthetic chemicals.

  Why You'll Love It:

  • Feeds plants 24/7 through natural microbial activity

  • Safe for indoor plants, herbs, and outdoor gardens

  • Never burns roots, unlike synthetic fertilizers

  • Increases water retention and reduces stress on your plants

  • Promotes larger leaves, stronger roots, and natural pest resistance

  • Boosts soil biodiversity for long-term plant and garden health

  How to Use:

  1. Sprinkle on top of soil – Use 1 tbsp per 6" pot, or 2 tbsp for 12" pots.
     (Tip: In high humidity, mix into the topsoil instead.)

  2. Water as usual – This activates the microbes.

  3. Watch the soil come alive – A fuzzy white growth may appear—this is healthy, active fungi!

  4. Repeat monthly for fast-growing houseplants, or every other month for slow growers.

  Key Ingredients:

  Organic wheat bran, molasses, beneficial probiotic strains (Lactobacillus, Bifidobacterium, Streptococcus), insect frass, kelp meal, rock dust, ocean water minerals, EM ceramic powder, and more—crafted to enhance soil structure and microbial health naturally.

  
  

Bios Yucca Extract

• Yucca Extract is a powerful, all-natural plant additive that helps water and nutrients stick, absorb, and spread more effectively—whether you're misting your leaves, hydrating moss poles, or watering thirsty soil.

  Made from Yucca schidigera extract, this botanical wetting agent contains natural saponins that reduce water tension, allowing moisture to coat leaves completely and soak deeper into the soil. It's especially useful when paired with foliar sprays, moss pole care, soil rehydration, or hydroponic growing systems.

  Why Use Yucca Extract?

  • Enhances foliar spray effectiveness by preventing water from beading off leaves

  • Keeps soil, moss poles, and coco poles hydrated longer

  • Improves nutrient uptake by increasing water absorption through the roots

  • Rehydrates peat-based or hydrophobic soil quickly and evenly

  • Feeds beneficial microbes and balances soil pH

  • Reduces salt buildup and supports healthy root development

  • Safe for all houseplants, herbs, and seedlings

  Seed Soak & Rooting Use:

  Soak cuttings or seeds in a 10% Yucca solution to boost root emergence, strengthen young roots, and promote early plant development.

  How to Mix:

  Add 0.25ml (1/16 tsp) per litre of water, stir or shake until foamy, and apply:

  • As a foliar mist

  • For watering your plants

  • To rehydrate moss poles or dry soil

  • During propagation or seed starting

  Use with every watering or as needed. Yucca is gentle and will not burn your plants, even if slightly overused.

Thrive Premium Organic Fertilizer

• If your houseplants need a consistent health boost, Thrive is the go-to plant multivitamin you’ve been looking for. Made from 100% Ascophyllum nodosum seaweed, this liquid fertilizer delivers over 60 active vitamins, minerals, and growth hormones to support strong, stress-resistant indoor plants.
• Ideal for tropical houseplants, succulents, cacti, and flowering varieties, Thrive seaweed fertilizer helps your plants handle the stress of indoor living—think dry air, irregular watering, and seasonal changes.

Why You'll Love Thrive:

• • Packed with natural plant growth hormones for faster, healthier growth

  • Enhances root health, stress resistance, and temperature tolerance

  • Boosts leaf vibrancy, new growth, and bloom potential

  • Safe and gentle enough for frequent use on all indoor plant types

  • Comes with a measured glass dropper for precision feeding

  • Makes up to 60 litres of ready-to-use fertilizer

How to Use:

• • Mix 1ml per 1L of water for general watering

  • Use 0.5ml per 1L for foliar misting or sensitive plants like succulents and cacti

  • Apply 3–4 times monthly during the growing season, and 1–2 times monthly in winter

  • Shake well before use to activate nutrients

NPK Ratio: 0.6 – 0 – 6

A low-nitrogen, potassium-rich formula perfect for promoting root strength, leaf development, and flower production without overstimulating growth.

Thrive Boost Premium House Plant Fertilizer

• Boost is your go-to organic fertilizer for moments when your plants need a little extra support—whether they’re pushing out new growth, recovering from repotting, or preparing to bloom. Made from 100% hydrolyzed fish, this nutrient-rich formula helps sustain and stimulate the development of healthy leaves, flowers, and roots.

  Perfect for flowering houseplants, tropical foliage, or anything recently transplanted, Boost delivers fast-absorbing nutrients that encourage robust plant development and vibrant color.

  Why You'll Love Boost:

  • Stimulates root development and recovery after repotting

  • Encourages budding, flowering, and leaf expansion

  • Provides balanced nutrition for ongoing and active growth

  • 100% organic and safe for indoor plant use

  • Makes up to 30 litres of nutrient-rich liquid fertilizer

  How to Use:

  • Mix 5ml per 1L of water

  • Water your plant first, then add a splash of Boost fertilizer to the soil

  • Use up to 1 cup per plant

  • Apply during periods of new growth, after repotting, or to stimulate blooming

  NPK Ratio: 2 – 4 – 0.5

  A phosphorus-rich blend ideal for root strength, flower formation, and leaf support without excess nitrogen.

DirtnGrow Evolve Organic Ultra Indoor House Plant Fertilizer

• Looking for an effective, no-fuss way to nourish your houseplants? Evolve Organic Ultra Indoor House Plant Fertilizer is a concentrated liquid fertilizer designed to revitalize struggling plants, clean up dead or dying roots, and support strong, healthy indoor growth—all with an easy monthly application.

  Perfect for all types of houseplants, this formula promotes root health and nutrient absorption, helping your plants bounce back fast and thrive long-term. It’s great for beginners and seasoned plant lovers alike!

  Why You'll Love It:

  • Works on all indoor houseplants

  • Cleans up dead roots and encourages healthy root development

  • Quickly revives stressed or struggling plants

  • Use monthly for consistent, easy care

  • Comes in a convenient 500ml bottle with a flip-top trap cap (just like ketchup!)

  • Larger sizes available—contact us directly!

  How to Use:

  • Mix 3ml per 1L of water

  • Apply directly to the soil once a month during regular watering

  • Suitable for foliage plants, flowering varieties, and more

  NPK Ratio: 1 – 2 – 1

  Balanced for root support, leaf development, and overall vitality.

MyGarden Liquid Fertilizer – Fish Fertilizer

• myGarden Fish Fertilizer is your go-to solution for healthier, more vibrant plants—indoors and out. This 5-2-2 fish emulsion-based fertilizer delivers essential nutrients and beneficial micronutrients that fuel vigorous plant growth, enhance soil fertility, and promote long-term garden health.

  Made from natural fish hydrolysate, urea, and sulfate of potash, this eco-friendly formula is ideal for gardeners looking for a sustainable fertilizer that supports both plant performance and soil structure.

  Why You'll Love myGarden Fish Fertilizer:

  • Balanced 5-2-2 NPK formula for steady growth, root strength, and resilience

  • Boosts vegetative growth and encourages lush green foliage

  • Promotes root development, flowering, and fruit production

  • Increases resistance to pests, disease, and environmental stress

  • Fortified with calcium, magnesium, and sulfur for deeper soil and plant health

  • Versatile for both foliar sprays and soil feeding

  NPK Breakdown (5-2-2):

  • 5% Nitrogen (N): Stimulates leafy growth and stem strength

  • 2% Phosphorus (P): Encourages root growth and flower/fruit development

  • 2% Potassium (K): Improves plant immunity and stress tolerance

  Secondary Nutrients:

  • Calcium: Strengthens plant cell walls and supports structural growth

  • Magnesium: Boosts chlorophyll production and photosynthesis

  • Sulfur: Supports protein synthesis and overall plant metabolism

  How to Use:

  • For foliar feeding: Dilute 2–5 ml per 1L of water and spray directly on leaves

  • For soil application: Dilute 3–5 ml per 1L of water and apply at the root zone

  • Apply weekly during the growing season for best results

  • Store in a cool, dry place out of direct sunlight

Jobe’s Fertilizer Spikes for Beautiful Houseplants

• If you're looking for a no-mess, low-maintenance way to fertilize your houseplants, Jobe’s Houseplant Plant Food Spikes are the perfect solution. These pre-measured fertilizer spikes are designed to deliver a steady supply of nutrients directly to the roots—right where your plants need it most.

  With an NPK ratio of 13-4-5, Jobe’s spikes provide a nitrogen-rich formula that supports lush foliage, healthy roots, and overall plant vitality. They’re ideal for anyone who wants to avoid the hassle of liquid feeding or granular fertilizer.

  Why Choose Jobe’s Fertilizer Spikes:

  • Feeds continuously for up to 2 months

  • No mixing, measuring, or mess—just insert into the soil

  • Safe for all indoor houseplants including foliage, flowering, and tropical varieties

  • Won’t wash away when watering, unlike liquid fertilizers

  • Convenient and odor-free

  • Great for busy plant owners or beginners

  NPK Ratio: 13 – 4 – 5

  High nitrogen to support leaf growth and green color, with balanced phosphorus and potassium for root strength and plant resilience.

  Size & Application:

  • Comes with 50 spikes per package

  • Insert into soil around the base of your plant

  • Reapply every 8 weeks

  
  

DirtnGrow Organic Ultra Orchid Plant Fertilizer

• Evolve Organic Ultra Orchid Fertilizer is specially formulated to meet the unique needs of orchids, helping them grow strong roots and produce stunning, long-lasting blooms. With a balanced 1-2-1 NPK ratio, this liquid fertilizer supports every stage of orchid development—from root support to flowering.

  This gentle, organic orchid fertilizer is easy to use, beginner-friendly, and ideal for a wide range of orchid types including Phalaenopsis, Dendrobium, and Cattleya.

  Why You'll Love It:

  • Designed specifically for indoor orchids

  • Balanced nutrients promote healthy roots, leaves, and blooms

  • Gentle enough for regular use without burning roots

  • Comes in a 500ml flip-top trap cap bottle for easy measuring

  • Larger sizes available – contact us for bulk options!

  NPK Ratio: 1 – 2 – 1

  • Nitrogen (1%) – supports leaf development

  • Phosphorus (2%) – encourages flowering and root health

  • Potassium (1%) – improves overall plant strength and resilience

  How to Use:

  • Mix 3ml per 1L of water

Apply during regular watering, typically every 2–4 weeks during the growing and blooming season

myGarden Cactus Fertilizer – Balanced Liquid Feed for Blooming & Healthy Cacti

myGarden Cactus Fertilizer is a liquid fertilizer specially formulated for cacti and succulents, designed to support compact growth, root development, and vibrant flowering. With a low-nitrogen, bloom-boosting 2-7-7 NPK ratio, this formula gives your cactus exactly what it needs to stay strong, flower beautifully, and thrive in tough conditions.

Whether you’re caring for a single cactus or growing a full succulent shelf, this nutrient-rich blend ensures your plants receive the targeted care they need—without overstimulation.

Why You’ll Love myGarden Cactus Fertilizer:

• • Optimized 2-7-7 NPK supports blooming and root strength without excessive leafy growth

  • Encourages compact structure, strong stems, and healthy roots

  • Promotes stunning flowers and long-lasting plant health

  • Includes key micronutrients like iron, zinc, and boron to support color, growth, and flower development

  • Perfect for indoor cactus collections or individual potted cacti

Key Nutrients:

• • 2% Nitrogen (N): Minimal vegetative growth for compact, healthy plants

  • 7% Phosphorus (P): Boosts root development and flower production

  • 7% Potassium (K): Supports overall health, disease resistance, and resilience

Added Micronutrients:

• • Iron: Enhances photosynthesis and deep green coloration

  • Zinc: Aids in enzyme function and growth

  • Boron: Vital for cell wall strength and flowering

How to Use:

• • • • Dilute 1ml per 1L of water and use each time you water your cactus

      • 1 pump = 2ml for easy, mess-free measuring

      • Apply during the growing season for best results

How and When to Fertilize Indoor Houseplants

When to Feed:

• Fertilize most houseplants every 4–6 weeks during active growing seasons (spring and summer).
• Reduce or pause feeding during winter when growth slows.

Tips for Success:

• Always follow dilution instructions for liquid fertilizers.
• For blooming plants, switch to a fertilizer with a higher phosphorus content to encourage flowers.
• Combine regular feeding with proper watering and lighting for best results.

 

Indoor Fertilizer FAQs

Do all houseplants need fertilizer?
Yes, all indoor plants benefit from fertilizer since potting soil loses nutrients over time.

Can I use outdoor fertilizer indoors?
It’s not recommended—indoor fertilizers are formulated for smaller pots and won’t risk overfeeding sensitive roots.

What’s the difference between organic and synthetic houseplant fertilizers?
Organic fertilizers improve soil health and release nutrients slowly, while synthetic ones offer quick, concentrated feeding.

How do I know if I over-fertilized my plant?
Signs include yellow or brown leaf tips, weak growth, or crusty soil buildup.

 

Conclusion – Explore More Plant Care Topics

Feeding your houseplants is only one part of helping them thrive. Leaf sprays keep foliage glossy and pest-free, while rooting gels ensure successful propagation when starting new plants. Want to learn more? Check out our in-depth blogs on Leaf Sprays, Rooting Gels, and Outdoor Fertilizers for expert plant care tips. 

Shop the full collection of indoor houseplant fertilizers