Best Fertilizers for Growing Garlic Plants

Garlic, with its distinct flavour and culinary versatility, is a beloved addition to gardens and kitchens across the UK. Whether you’re a seasoned gardener or a novice, growing garlic can be a rewarding experience.

Proper fertilisation is key to ensure your garlic bulbs develop into robust and flavorful cloves. In this comprehensive guide, we’ll explore the best fertilizers to use for growing garlic in the UK, helping you achieve a bountiful harvest that will elevate your culinary creations.

The Importance of Fertilizing Garlic

Before delving into the best fertilizers for garlic, it’s essential to understand why fertilization matters. Garlic is a nutrient-hungry plant that requires adequate nourishment to thrive. Proper fertilization provides essential nutrients that support healthy growth, bulb formation, and overall plant vigour.

When it comes to garlic, the two primary phases to consider are:

1. Early Growth Stage: During the initial stages of growth, garlic benefits from a balanced fertilizer with a nitrogen-phosphorus-potassium (N-P-K) ratio suited for root development and foliage growth.

2. Bulb Formation Stage: As garlic plants transition to bulb formation, a fertilizer with reduced nitrogen content and an emphasis on phosphorus and potassium becomes crucial. This shift encourages the development of plump, flavourful bulbs.

Now, let’s explore the best fertilizer options for growing garlic in the UK.

Types of Fertilizers for Garlic Plants

Organic Matter and Compost

One of the most valuable fertilizers for garlic is organic matter, such as compost. Compost enriches the soil with essential nutrients, improves soil structure, and enhances its water-retention capacity.

Incorporate well-rotted compost into your garlic bed before planting or as a top dressing during the growing season. It’s an eco-friendly and sustainable choice for promoting healthy garlic growth.

Nitrogen-Rich Fertilizers

During the early growth stage, garlic benefits from a nitrogen-rich fertilizer to encourage strong root development and lush foliage.

Options like blood meal or fish emulsion, which release nitrogen slowly, can provide the necessary nutrients without overwhelming the plant. Apply these fertilizers according to the manufacturer’s instructions or follow organic gardening practices.

Phosphorus and Potassium Fertilizers

As garlic transitions to bulb formation, it requires higher phosphorus and potassium levels. These nutrients promote robust bulb development and enhance garlic’s flavour and storage potential.

A balanced, slow-release fertilizer with an N-P-K ratio of around 5-10-10 or 6-12-12 is ideal for this stage. Incorporate it into the soil or apply it as a top dressing to meet the changing nutritional needs of the garlic plant.

Bone Meal

Bone meal is an excellent organic source of phosphorus for garlic. It provides a slow-release form of phosphorus that supports bulb formation and overall plant health. Mixing bone meal into the soil before planting or applying it as a side dressing during the growing season can significantly benefit your garlic crop.

Wood Ash

Wood ash from your fireplace or wood-burning stove can serve as a valuable source of potassium and trace minerals for garlic. However, using wood ash sparingly is important, as excessive amounts can raise soil pH levels. A light dusting of wood ash incorporated into the soil can provide the necessary potassium boost.

How to Apply Fertilizer

Proper application of fertilizer is essential for maximizing its benefits and preventing over-fertilization, which can harm your garlic crop. Here are some tips for applying fertilizers:

  1. Pre-Planting: Incorporate well-rotted compost and organic matter into the garlic bed before planting. This sets the foundation for healthy growth.
  2. Side-Dressing: During the growing season, consider side-dressing your garlic with a balanced fertilizer, bone meal, or wood ash. Apply the fertilizer about 6 inches away from the base of the plants to avoid direct contact with the garlic.
  3. Follow Instructions: Always follow the manufacturer’s instructions when applying synthetic or organic fertilizers. Over-application can lead to nutrient imbalances.
  4. Watering: After applying fertilizer, water the garlic bed thoroughly to help the nutrients penetrate the soil and reach the roots.


Growing garlic in the UK can yield a delightful and flavourful addition to your culinary adventures. By selecting the right fertilizers and applying them strategically, you can ensure your garlic crop receives the nutrients it needs to thrive. Whether you prefer organic options like compost and bone meal or choose balanced synthetic fertilizers, proper nutrition is the secret to growing robust garlic bulbs that will elevate your dishes to new heights.