Lavender is a beloved plant for its calming fragrance, elegant appearance, and low-maintenance nature. But to help it thrive — whether in a pot, garden bed, or windowsill planter — choosing the right fertilizer can make all the difference. The best fertilizer for lavender should support blooming, oil production, and healthy root development without encouraging excessive leafy growth.
Below are five top-rated fertilizers specifically formulated or well-suited for lavender. Each product is designed to provide balanced nutrition and promote vibrant, long-lasting flowers.
Top 5 Products for Healthy, Fragrant Blooms
1. Premium Liquid Lavender Plant Fertilizer – Gardenera (3-1-2 NPK)
Size: 8 oz
Type: Organic Liquid Concentrate
Best For: Indoor potted lavender and flowering herbs
This Gardenera fertilizer is specially designed for lavender, with a 3-1-2 NPK ratio that supports balanced growth and flower production. It’s easy to use, organic, and safe for regular feeding. The low nitrogen content helps prevent leggy growth, while phosphorus and potassium boost blooms and resilience.
Highlights:
Lavender-specific formulation
Organic and safe for indoor use
Promotes blooming and healthy roots
2. Organic Seaweed Fertilizer for Lavender (8 oz)
Size: 8 oz
Type: Liquid Kelp Fertilizer
Best For: Indoor & outdoor lavender in all stages
Seaweed extract is a time-tested tonic for herbs like lavender. Rich in micronutrients, potassium, and natural growth hormones, this kelp-based fertilizer encourages root health, disease resistance, and oil production. It’s particularly useful for lavender grown in containers or poor soil.
Highlights:
Made from natural seaweed
Enhances oil content and bloom vigor
Supports soil health and root growth
3. Professional Lavender Superfood Spray Mist – 18 Essential Nutrients
Size: 8 oz
Type: Foliar Spray Mist
Best For: Quick nutrient delivery for stressed or weak plants
This superfood foliar mist delivers 18 essential vitamins and minerals directly to the leaves for fast absorption. Enriched with micro-fungi and beneficial microbes, it promotes greener foliage and stronger growth. Ideal for gardeners looking to revive or boost their plants between soil feedings.
Highlights:
Micro-fungi enriched formula
Works through leaf absorption
Excellent supplement for potted plants
4. Lavender & Rosemary – Lamiaceae Liquid Fertilizer (Made in Germany)
Size: Variable
Type: High-Tech Liquid NPK Fertilizer
Best For: Serious gardeners and greenhouse setups
Tailored for lavender and rosemary, this high-tech fertilizer provides complete nutrition for both soil and foliar feeding. Manufactured in Germany, it blends NPK elements with root and flower stimulants to enhance oil production, flower longevity, and plant structure.
Highlights:
Specialized for Lamiaceae species
Can be used as root drench or foliar feed
Boosts essential oil content
5. PROFESSIONAL Liquid Silica Plant Supplement – 32oz
Size: 32 oz (Makes up to 180 gallons)
Type: Liquid Silica Supplement
Best For: Strengthening stems and overall plant resilience
While not a complete fertilizer on its own, this liquid silica supplement is the perfect booster for any lavender feeding regimen. Silica enhances stem strength, disease resistance, and drought tolerance—critical for outdoor lavender exposed to harsh conditions.
Highlights:
Increases stem thickness and durability
Ideal companion to NPK fertilizers
Promotes healthy foliage and structure
Tips for Fertilizing Lavender Effectively
Use sparingly: Lavender thrives in lean soils; too much fertilizer can cause excessive leafy growth and reduce flower quality.
Fertilize in spring: Apply fertilizer early in the growing season as new growth appears.
Avoid high-nitrogen blends: Excess nitrogen leads to lush foliage at the expense of blooms.
Ensure good drainage: No fertilizer can help lavender if roots are sitting in wet soil.
Final Thoughts
Choosing the best fertilizer for lavender depends on your growing setup and goals. For flowering power and essential oil quality, liquid seaweed or a lavender-specific blend like Gardenera is ideal. For structural strength, silica supplements offer added support. Foliar sprays provide a quick boost, especially for indoor plants.
With the right nutrition and care, your lavender will reward you with stunning purple blooms and an unforgettable fragrance.
