Orchids are exotic, stunning, and rewarding plants, but they require specific care to thrive. Fertilisation plays a vital role in their growth and blooming. With the right fertiliser, you can enhance your orchids’ health, encourage frequent blooming, and promote robust root development. However, choosing the right one can be overwhelming due to the wide variety of options available.
In this guide, we’ll explore the 10 best fertilisers for healthy orchid growth, helping you understand what each product offers and how to use it effectively.
- 1 Why fertilising orchids is important
- 2 Key nutrients for orchids include:
- 3 What to Look for in Orchid Fertilisers
- 4 Top 10 Best Fertilisers for Healthy Orchid Growth
- 5 1. Miracle-Gro Water Soluble Orchid Food
- 6 2. Schultz Orchid Food 19-31-17
- 7 3. Jack’s Classic Orchid Special 30-10-10
- 8 4. Better-Gro Orchid Plus 20-14-13
- 9 5. MSU Orchid Fertiliser 19-4-23
- 10 6. Dyna-Gro Orchid Pro 7-8-6
- 11 7. Orchid Myst Spray
- 12 8. Osmocote Smart-Release Vegetable & Flower Plant Food.
- 13 Advanced 2-in-1 Systemic Rose and Flower Care from Bayer.
- 14 10. EarthPods Orchid Plant Food Capsules
- 15 FAQs
Why fertilising orchids is important
Orchids, like other plants, require essential nutrients to grow. In their natural habitats (such as rainforests), they receive nutrients from decaying organic matter around them. When grown at home, orchids don’t have access to these natural nutrient sources, which is why fertilising is crucial.
Key nutrients for orchids include:
Nitrogen (N): Encourages healthy leaf growth.
Phosphorus (P): Supports blooming and root development.
Potassium (K) enhances the resilience and general health of plants.
Calcium and magnesium: These secondary nutrients are important for root health and maintaining the plant’s structure.
Using the right fertiliser ensures your orchid receives these nutrients, fostering vibrant blooms, healthy foliage, and robust roots.
Orchids number chart summarizing the key details of the best orchid fertilizers:
| Fertilizer Name | Type | Best For | How to Use | Frequency |
|---|---|---|---|---|
| Miracle-Gro Orchid Food | Water-soluble | General orchid care | Mix with water and apply | Every 2 weeks |
| J R Peters Jack’s Classic Orchid Fertilizer | Water-soluble | Phalaenopsis orchids | Mix with water and apply | Every 7-14 days |
| EarthPods Orchid Plant Food Capsules | Organic capsules | Organic orchid care | Insert capsules into potting media | Every 10-14 days |
| Schultz Orchid Food | Liquid | Boosting blooms | Mix with water and apply | Weekly during flowering |
| Better-Gro Orchid Plus | Water-soluble | General orchid health | Mix with water and apply | Every 2 weeks |
| Espoma Organic Orchid Food | Organic liquid | Organic orchid care | Mix with water and apply | Every 2-4 weeks |
| Dynagro Orchid Pro | Liquid | Comprehensive orchid care | Mix with water and apply | Every 2 weeks |
| Osmocote Smart-Release Plant Food | Slow-release | Low-maintenance orchid care | Sprinkle on top of potting media | Every 4-6 months |
| Bayer Advanced Orchid Care | Granular | Pest control and feeding | Sprinkle around the roots | Monthly |
| Michigan State University Orchid Fertilizer | Water-soluble | Orchids in varying light conditions | Mix with water and apply | Every 2 weeks |
What to Look for in Orchid Fertilisers
Before we dive into our top picks, it’s essential to know what to look for when selecting a fertiliser for orchids.
Balanced NPK Ratio: A balanced formula with equal amounts of nitrogen, phosphorus, and potassium (like a 20-20-20 mix) works well for orchids. However, some orchids benefit from higher phosphorus levels during blooming.
Slow-Release vs. Water-Soluble: While water-soluble fertilisers are best for quick effects, slow-release fertilisers offer a consistent supply of nutrients over time. Orchids generally respond well to water-soluble fertilisers since they allow for controlled feeding.
Organic vs. Synthetic: Organic fertilisers come from natural sources and improve soil health, while synthetic fertilisers deliver nutrients in a more controlled and concentrated form. Both types can work well depending on your plant’s needs.
Micronutrients: Look for fertilisers that contain micronutrients like calcium, magnesium, iron, and zinc, which are vital for orchid health.
Ease of Use: Choose a fertiliser that fits your lifestyle. If you prefer not to fertilise frequently, a slow-release option might be ideal, whereas water-soluble options are better suited for regular fertilisation schedules.
Top 10 Best Fertilisers for Healthy Orchid Growth
1. Miracle-Gro Water Soluble Orchid Food
Miracle Gro is a household name in plant care, and their water-soluble orchid food lives up to the brand’s reputation. With a 30-10-10 ratio, this fertiliser has a high nitrogen content to encourage robust roots and luxuriant leaf growth.
Best For: Boosting leaf and root growth.
How to Use: Dissolve ¼ teaspoon in a gallon of water and apply every two weeks during the growing season.
Pros: Fast-acting, widely available, easy to use.
Cons: Not ideal for bloom stimulation.
This formula works best during the growing season, when orchids focus on developing foliage and root systems. While it’s not primarily a bloom booster, it will help your orchid build the strength needed to flower later.
2. Schultz Orchid Food 19-31-17
Schultz Orchid Food offers a higher phosphorus content (31%) to encourage blooming. This 19-31-17 formula helps ensure a beautiful display of flowers by supporting both blooming and root development.
Best For: Promoting more frequent blooms.
How to Use: Feed every two weeks, using ½ teaspoon per gallon of water.
Pros: Encourages blooming; affordable.
Cons: requires frequent application.
If your orchid struggles to bloom, this is an excellent choice, particularly for plants like Phalaenopsis or Cattleya that bloom periodically.
3. Jack’s Classic Orchid Special 30-10-10
Jack’s Classic Orchid Special is another high-nitrogen option, perfect for orchids during the growing season. Its high nitrogen content promotes rapid foliage development, making it a favourite for boosting overall plant health.
Best For: Enhancing leaf and root growth.
How to Use: Mix ¼ teaspoon per gallon of water and use every two weeks during active growth periods.
Pros: Quick absorption supports strong plant development.
Cons: May require additional supplements during blooming.
While Jack’s Classic is effective for growth, you may need to switch to a bloom booster once your orchid enters its flowering stage.
4. Better-Gro Orchid Plus 20-14-13
This balanced fertiliser from Better-Gro contains the ideal mix of nitrogen, phosphorus, and potassium, along with essential micronutrients like copper, iron, and zinc. It’s designed for all types of orchids and supports both growth and bloom development.
Best For: Overall plant health and balanced growth.
How to Use: Use 1 teaspoon per gallon of water every two weeks.
Pros: Includes micronutrients; versatile.
Cons: Not slow-release.
Better-Gro Orchid Plus is perfect for general care, providing a well-rounded nutrient mix to support the overall health of your orchid.
5. MSU Orchid Fertiliser 19-4-23
Developed by Michigan State University researchers, the MSU Orchid Fertiliser formula is particularly effective for orchids grown in soilless media, like bark or sphagnum moss. The high potassium content (23%) ensures resilient plants capable of withstanding stress.
Best For: Orchids grown in bark or moss media.
How to Use: Dissolve ¼ teaspoon in a gallon of water and apply weekly.
Pros: Ideal for soilless media, supports resilience.
Cons: Slightly more expensive than other options.
MSU Orchid Fertiliser’s unique formulation is designed specifically for orchids, so you can trust that it will deliver optimal results.
6. Dyna-Gro Orchid Pro 7-8-6
Dyna-Gro Orchid Pro is a lower-nitrogen option that provides a balanced nutrient mix. Its slightly higher phosphorus content (8%) supports flowering, while the addition of trace minerals promotes strong, healthy growth.
Best for: Regular feeding and moderate growth.
How to Use: Use ¼ teaspoon per gallon of water weekly or biweekly.
Pros: Contains micronutrients; low salt buildup.
Cons: Needs more frequent application for optimal results.
Dyna-Gro is a trusted name in horticulture, and this fertiliser is particularly beneficial for plants that need a balanced feeding regime.
7. Orchid Myst Spray
Orchid Myst takes a different approach with its foliar spray formula. This product delivers nutrients directly to the leaves, roots, and aerial roots, mimicking how orchids absorb nutrients in their natural habitat.
Best For: Easy, no-mess fertilisation.
How to Use: Spray onto leaves, roots, and aerial roots weekly.
Pros: No mixing required, convenient for indoor orchids.
Cons: May not replace root-feeding entirely.
Orchid Myst is perfect for orchid owners who prefer a low-maintenance approach to fertilizing. It’s also a great option for orchids mounted on bark.
8. Osmocote Smart-Release Vegetable & Flower Plant Food.
While not specifically formulated for orchids, Osmocote’s Smart-Release Plant Food works wonders for plants grown in containers. This slow-release formula feeds your orchids for up to six months, providing a steady supply of nutrients without frequent application.
Best For: Busy gardeners or those who prefer a low-maintenance solution.
How to Use: Apply directly to potting media, following the package’s guidelines.
Pros: long-lasting, easy to use.
Cons: Not formulated exclusively for orchids.
If you prefer not to fertilise regularly, Osmocote’s slow-release formula is a great way to ensure your orchids still receive the nutrients they need.
Advanced 2-in-1 Systemic Rose and Flower Care from Bayer.
Though marketed primarily for roses, Bayer Advanced 2-in-1 Systemic Rose & Flower Care can be used effectively on orchids as well. It’s a granular formula that not only feeds your plants but also provides systemic protection against pests.
Best For: Orchids prone to pest infestations.
How to Use: Apply granules to potting media, following the instructions.
Pros: Combines fertilisation with pest protection.
Cons: Contains synthetic chemicals.
For orchids that struggle with pests, Bayer’s formula can provide both nourishment and a safeguard against common invaders like aphids and mites.
10. EarthPods Orchid Plant Food Capsules
For organic growers, EarthPods Orchid Plant Food Capsules offer a natural and convenient solution. These pre-measured capsules deliver nutrients directly to the roots when watered, providing a steady and balanced supply of nutrients.
Best For: Organic orchid care and low-maintenance feeding.
How to Use: Insert 1-2 capsules into the potting media every 10-14 days.
Pros: Organic; no mixing required.
Cons: May not offer as fast results as synthetic fertilizers.
Choosing the right fertiliser is crucial for promoting healthy orchid growth, vibrant blooms, and overall plant vitality. Whether you prefer slow-release, liquid, or organic options, the key is to provide your orchids with the balanced nutrients they need at the appropriate times. From trusted brands like Miracle-Gro to organic solutions like EarthPods, each fertiliser offers unique benefits depending on your growing style and orchid type. Regular feeding, combined with proper watering and light, will ensure your orchids thrive and reward you with stunning, long-lasting flowers.
FAQs
How often should I fertilize my orchid?
Orchids generally benefit from being fertilized every two weeks during their active growing season (spring and summer). During the fall and winter months, you can reduce fertilization to once a month, or stop altogether if the plant is dormant.
Can I use regular houseplant fertilizer on my orchids?
While you can use a balanced houseplant fertilizer, it’s best to choose one specifically formulated for orchids. Orchid-specific fertilizers have the correct balance of nutrients and are less likely to cause salt buildup or nutrient burn.
3Which NPK ratio is ideal for fertilising orchids?.
The ideal NPK (Nitrogen, Phosphorus, Potassium) ratio depends on the growth stage of your orchid. A balanced fertilizer like 20-20-20 works well for general growth, while a high-phosphorus blend, such as 10-30-20, can encourage blooming.
Should I fertilize my orchid when it’s in bloom?
It’s generally okay to fertilize your orchid when it’s in bloom, but use a diluted solution or a bloom booster fertilizer with a higher phosphorus content. Be careful not to over-fertilize, as this could damage the flowers.
Can over-fertilizing harm my orchid?
Yes, over-fertilizing can lead to nutrient burn, which may damage your orchid’s roots and leaves. It can also cause salt buildup in the potting medium, leading to poor plant health. Always follow the recommended dosage and dilute fertilizers accordingly.
Can I use organic fertilizers for orchids?
Yes, organic fertilizers are a great option for orchids. Products like compost tea, fish emulsion, or EarthPods Orchid Plant Food Capsules provide nutrients in a more natural, slow-release form. However, be cautious with over-application, as organic fertilizers can sometimes attract pests or cause fungal issues if overused.
What’s the difference between slow-release and water-soluble fertilizers?
Slow-release fertilizers gradually provide nutrients over an extended period, usually 3-6 months, and are ideal for low-maintenance care. Water-soluble fertilizers dissolve in water and deliver nutrients immediately but need to be applied more frequently (every two weeks).
Can I make my own orchid fertilizer?
Yes, you can create a homemade orchid fertilizer by using natural ingredients like banana peels, egg shells (for calcium), or diluted compost tea. However, make sure the nutrients are balanced and that the homemade fertilizer is not too concentrated, as orchids are sensitive to nutrient overload.
Is foliar feeding beneficial for orchids?
Foliar feeding, where you spray fertilizer directly onto the leaves, can be beneficial for orchids. Products like Orchid Myst provide nutrients in a way that mimics natural feeding conditions in the wild. However, foliar feeding shouldn’t replace regular root feeding but can be a supplementary method.
Do I need to flush the potting media after fertilizing?
Yes, it’s a good idea to flush the potting media every month or so to remove any salt buildup from fertilizers. Simply water the orchid thoroughly with plain water until it drains out of the bottom of the pot. This helps prevent root burn and keeps the potting medium healthy.