what is the best fertilizer for lavender

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Lavender is beloved in New Zealand gardens for its soothing fragrance, gorgeous blooms, and ability to thrive in challenging spots. But if you want healthy, productive lavender with abundant flowers and aromatic leaves, it’s vital to know: what is the best fertilizer for lavender? The right plant food can make the difference between sparse, straggly growth and lush mounds of silvery-green foliage. On this page, we'll explore your fertiliser options, with a special focus on our Tree Fertiliser, and share practical tips for nurturing thriving lavender plants.

Tree Fertiliser (Tree Fertiliser)

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Tree Fertiliser, Tree And Shrub Fertiliser, Shrub Fertiliser

Using tree fertiliser results in plants having better quality foliage, more profuse flowering, stronger stems, and a much healthier and brighter looking plant. The Plant Company’s Tree (and Shrub) Fertiliser has been specifically blended to give 12-months of continuous nutrition and give the plants an initial boost with all right nutrients. This tree fertiliser blend is suitable for all types of Trees and Shrubs that are planted outdoors and should not be used for plants grown in a container. Use The Plant Company Indoor Plant Fertiliser for container grown plants. One kg of fertiliser will adequately fertilise 12 plants for one year.

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Understanding Lavender’s Fertilizer Needs

Lavender hails originally from the dry, rocky hillsides of the Mediterranean and has evolved to prefer lean soils. Overfeeding can actually do more harm than good. When considering what is the best fertilizer for lavender, it’s important to choose a product that is low in nitrogen but provides essential minerals like potassium and phosphorus for flower development.

Why Choose Tree Fertiliser for Lavender?

Our Tree Fertiliser is specially blended to deliver balanced nutrition, supporting woody perennials like lavender without encouraging lush, weak leafy growth that’s prone to disease. This slow-release formulation offers steady access to nutrients, which is ideal for lavender’s preference for less frequent feeding. Unlike high-nitrogen options, Tree Fertiliser gently boosts root growth and encourages an abundance of blooms.

Many commercial fertilisers are designed for lawns or vegetables and can overwhelm lavender. In contrast, Tree Fertiliser is tailored for robust, manageable growth. Gardeners who want to use Tree Fertiliser will find that applying a small amount during spring—when lavender wakes from winter dormancy—sets the stage for healthy flowering.

How to Apply Fertilizer for Lavender

For established plants, gently work a small handful of Tree Fertiliser around the root zone in early spring. Water well to help nutrients percolate into the soil. Avoid fertilising again until the next growing season, as too much can compromise the plant’s aromatic oils and flower production.

Newly planted lavender in the garden or in PB¾ Planter Bags (Planting Bags) also benefits from a modest dose after planting—just take care not to overfeed. If you’re growing lavender from cuttings, starting in a Deep Square 28-Cell Tray is recommended until the root system is established.

Other Garden Uses for Tree Fertiliser

Because Tree Fertiliser is suitable for so many woody perennials, you can use leftover product on fruit trees, natives, or hardy shrubs—making it a versatile choice. Complement your lavender border with a low-maintenance lawn of Fine Fescue Lawn Seed or Tall Fescue, and feed as needed with our specialised Lawn Fertiliser or New Lawn Fertiliser.

Final Tips for Healthy Lavender

Remember, well-draining soil, full sun, and minimal fertiliser are the secrets to beautiful lavender. For planting in containers, opt for PB12 Planter Bags (Grow Bags For Plants) and line walkways with 1m wide Black Polythene for weed control. With careful feeding and the right products, your lavender will reward you with years of scented abundance.

Now you know what is the best fertilizer for lavender—choose Tree Fertiliser and nurture your plants the expert way.

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Whether you need assistance finding the plant you’re looking for or you simply want to know more about who we are and what we do, we invite you to get in touch with us today. A member of The Plant Company team will get back in touch as soon as possible.