How to make homemade fertilizer for indoor bonsai trees?

Indoor bonsai tree care

Indoor bonsai trees are delicate and beautiful plants that require special care to thrive. Along with regular watering and pruning, providing the right nutrients is crucial for the health and growth of your indoor bonsai tree. While there are many commercially available fertilizers designed for bonsai trees, making homemade fertilizer can be a cost-effective and sustainable alternative. In this article, we will guide you on how to make homemade fertilizer for your indoor bonsai trees specifically.

Homemade fertilizer for indoor plants 

Indoor plants, including bonsai trees , require a balanced optimal combination of nutrients for growth. Making your own fertilizer gives you control over the ingredients and ensures that your plants receive the necessary nutrients without any harmful chemicals. Here's a simple recipe for homemade fertilizer suitable for indoor plants:


  • 1 part compost
  • 1 part vermicompost (worm castings)
  • 1 part aged manure
  • 1 part bone meal
  • 1 part rock phosphate
  • 1 part kelp meal

Mix all the ingredients thoroughly in a bowl or bucket. This homemade fertilizer provides a balanced blend of organic matter, essential minerals, and nutrients that are beneficial for the growth and development of indoor plants.


Apply the homemade fertilizer to your indoor bonsai trees once every month during the growing season, which typically spans from early spring to late summer. Sprinkle a thin layer of the fertilizer mixture on the soil surface surrounding the tree, avoiding contact with the trunk or foliage. Water the bonsai tree immediately after applying the fertilizer to help the nutrients penetrate the soil effectively.

Homemade fertilizer for bonsai

Bonsai trees are miniature living sculptures that require precise care, including specific nutritional requirements. Homemade fertilizers can be tailored to meet the unique needs of bonsai trees, ensuring they receive the appropriate balance of nutrients. Here's a specialized recipe for homemade fertilizer for bonsai trees:


  • 1 part peat moss
  • 1 part perlite
  • 1/2 part bone meal
  • 1/4 part kelp meal
  • 1/4 part blood meal

Mix the thoroughly ingredients in a container. This homemade bonsai tree fertilizer provides the necessary nutrients, organic matter, and improved drainage for the bonsai's small container environment.


Apply the homemade bonsai tree fertilizer approximately every four to six weeks during the growing season, which varies depending on the specific bonsai tree species. Sprinkle the fertilizer mixture evenly on the soil surface around the base of the bonsai, avoiding contact with the trunk or foliage. Water the bonsai tree gently after fertilizing to help the nutrients settle into the soil.

Indoor bonsai fertilizer guide

A well-fed bonsai tree is more likely to thrive and showcase its natural beauty. To ensure the health and growth of your indoor bonsai, follow these fertilizer guidelines:

1. Choose the right fertilizer:

When selecting or making a fertilizer, opt for a balanced formula that provides essential macronutrients such as nitrogen (N), phosphorus (P), and potassium (K). These macronutrients support various aspects of plant growth and development.

2. Understand your bonsai's nutritional needs:

Different bonsai tree species have varying nutritional requirements. Research your specific bonsai tree species to determine the optimal nutrient levels and choose or tailor your homemade fertilizer accordingly.

3. Fertilize during the growing season:

Bonsai trees have an active growth phase during specific seasons. Fertilize your indoor bonsai trees only during their active growing period to avoid overfeeding or nutrient imbalance during dormancy.

4. Avoid excessive fertilization:

Overfertilizing can lead to salt build-up in the soil, which can harm the roots and overall health of your bonsai tree. Follow the recommended dosage and frequency specified in the fertilizer instructions or adjust your homemade fertilizer recipe accordingly.

5. Water before and after fertilizing:

Before applying any fertilizer, ensure the soil is slightly moist. After fertilizing, water the bonsai tree gently to help the nutrients dissolve and spread evenly in the soil.

6. Monitor the plant's response:

Observe your bonsai tree's response to the fertilizer. Healthy growth, vibrant foliage, and increased vigor indicate that the fertilizer is effectively meeting the plant's nutritional needs. If you notice any adverse effects, such as leaf burn or stunted growth, adjust the fertilizer dosage or composition accordingly.

Indoor bonsai tree nutrition

Proper nutrition is essential for the overall health and vitality of indoor bonsai trees. Along with sunlight and water, bonsai trees require specific nutrients to support their growth and maintain their stunning appeal. Here are the key nutrients and their roles in the nutrition of indoor bonsai trees:

Nitrogen (N):

Nitrogen promotes lush green foliage and strong stem growth. It is responsible for the production of chlorophyll, which enhances photosynthesis. A deficiency of nitrogen results in pale, yellowing leaves and stunted growth.

Phosphorus (P):

Phosphorus promotes root development, blooming, and fruiting in bonsai trees. It aids in energy transfer and plays a crucial role in flower production and overall plant vigor. Insufficient phosphorus can lead to weak roots, poor flowering, and reduced overall health.

Potassium (K):

Potassium is essential for overall plant health and plays a vital role in stress tolerance, disease resistance, and nutrient absorption. It helps regulate water balance, enzyme activation, and overall cellular functions.

Calcium (Ca):

Calcium is vital for cell wall development, root growth, and overall plant structure. It aids in nutrient uptake and helps prevent diseases caused by calcium deficiencies.

Magnesium (Mg):

Magnesium is a component of chlorophyll and plays a crucial role in photosynthesis. It promotes healthy foliage, enhances nutrient absorption, and aids in enzyme production. Magnesium deficiency can lead to yellowing or browning of leaves.

Sulfur (S):

Sulfur is an essential component of amino acids, which are building blocks of proteins. It aids in overall plant growth, root development, and nutrient utilization.

These essential nutrients, along with trace elements such as iron, manganese, zinc, and copper, ensure the proper nutrition and vitality of your indoor bonsai trees.

Organic bonsai tree fertilizer

Using organic fertilizers for bonsai trees offers numerous benefits, including improved soil structure, long-term sustainability, and reduced environmental impact. Organic fertilizers release nutrients slowly, providing a consistent supply of essential elements for your bonsai's growth. Here are some organic alternatives you can use as homemade bonsai tree fertilizer:

1. Compost:

Compost is a nutrient-rich organic matter that improves soil structure, water retention, and nutrient availability. It releases nutrients gradually, ensuring a steady and sustained supply of nourishment for your bonsai tree.

2. Worm castings (vermicompost):

Worm castings are a potent organic fertilizer rich in nutrients, beneficial bacteria, and enzymes. They enhance soil fertility, microbial activity, and overall plant health. Worm castings can be used as a standalone fertilizer or added to the homemade mixture fertilizer.

3. Manure:

Aged manure from herbivore animals, such as cows or horses, is a valuable source of nutrients for bonsai trees. It enriches the soil with organic matter, nitrogen, phosphorus, and potassium. However, ensure that the manure is well- aged to avoid the risk of burning the roots or introducing harmful pathogens.

4. Bone meal:

Bone meal is a slow-release organic fertilizer high in phosphorus and calcium. It promotes root development, flowering, and overall plant vigor. Bone meal can be included in the homemade bonsai tree fertilizer recipe to provide essential minerals.

5. Kelp meal:

Kelp meal is derived from seaweed and is an excellent source of trace minerals and natural growth hormones. It enhances plant growth, nutrient uptake, and tolerance to stress. Kelp meal can be added to the homemade bonsai tree fertilizer in small quantities.

These organic alternatives are readily available and provide a sustainable option for feeding your indoor bonsai trees while promoting the overall health of the plant and the surrounding environment.

Indoor bonsai plant food

Feeding your indoor bonsai tree with the right plant food is crucial for its overall health and well-being. Indoor bonsai trees are container-grown and have limited access to natural sources of nutrients. Here's a step-by-step guide to using plant food to nourish your indoor bonsai:

Step 1: Choose the right plant food:

Opt for a liquid or granular plant food specifically formulated for indoor plants, including bonsai trees. These plant foods usually contain a balanced blend of essential nutrients required for indoor plants' growth.

Step 2: Read the instructions:

Read and follow the instructions provided on the plant food packaging carefully. Pay attention to the recommended dosage, frequency of application, and any specific guidelines for indoor bonsai trees.

Step 3: Dilute liquid plant food (if applicable):

If you are using a liquid plant food, dilute it according to the instructions. Overdosing can harm your bonsai tree, so it's important to measure and dilute the plant food accurately.

Step 4: Apply plant food:

Apply the plant food as per the instructions provided. Pour the diluted liquid plant food or spread the granular plant food evenly on the soil surface around the base of the bonsai tree, avoiding contact with the trunk or foliage.

Step 5: Water after feeding:

Water the bonsai tree gently after applying the plant food. This helps dissolve the nutrients and distribute them evenly in the soil, ensuring optimal absorption by the bonsai's roots.

Step 6: Monitor growth and adjust:

Observe your indoor bonsai tree's response to the plant food. If you notice excessive growth, yellowing leaves, or signs of nutrient deficiency, adjust the dosage or frequency of application accordingly. Each bonsai tree has unique nutritional requirements , so it may take some experimentation to find the right balance.

Homemade bonsai tree fertilizer

Creating your own bonsai tree fertilizer allows you to tailor the nutrient composition to match your tree's specific needs. Here's a recipe for homemade bonsai tree fertilizer:


  • 1 part compost
  • 1 part perlite
  • 1 part aged bark chips
  • 1/2 part bone meal
  • 1/4 part fish meal
  • 1/4 part kelp meal

Mix all the ingredients thoroughly in a container. This homemade bonsai tree fertilizer provides a balanced blend of organic matter, minerals, and nutrients to support the growth and overall health of your bonsai tree.

Remember to adjust the application frequency and dosage based on your specific bonsai tree's nutritional requirements and growth rate.

With the right care and nutrition, your indoor bonsai trees will flourish and bring joy to your living space. Making homemade fertilizer not only allows you to customize the nutrient composition but also promotes sustainability and reduces reliance on commercially available products. Start experimenting with homemade fertilizers for your indoor bonsai trees and witness the stunning results!