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You can fertilize lavender plants lightly, because lavender is a low-feeding herb that thrives in poor to moderately fertile soil.
In fact, too much fertilizer can harm lavender more than help it, causing weak growth, fewer flowers, and even root problems.
If you have been wondering how to fertilize lavender plants the right way, the answer is simple: feed sparingly, choose the right nutrients, and time it with the growing season.
In this post, we will look at how to fertilize lavender plants properly, when to do it, and what to use so your lavender stays healthy and fragrant.
How to Fertilize Lavender Plants the Right Way
Learning how to fertilize lavender plants starts with understanding that lavender is not a heavy feeder.
This Mediterranean herb grows naturally in rocky, sandy, low-nutrient soils, so it does not need rich fertilizer to survive.
When you fertilize lavender plants, the goal is to support steady growth and blooming, not to push out lots of leafy green growth.
1. Use a Balanced or Low-Nitrogen Fertilizer
When you fertilize lavender plants, choose a balanced fertilizer or one that is low in nitrogen.
Nitrogen encourages leaf growth, and too much of it will make your lavender leggy and soft instead of compact and fragrant.
A fertilizer with an NPK ratio like 5-10-10 or 10-10-10 works well for lavender.
You can also use a slow-release fertilizer designed for flowering plants, but apply it at half the recommended strength.
2. Fertilize Once in Early Spring
The best time to fertilize lavender plants is in early spring, just as new growth begins to appear.
A single feeding at this time gives the plant enough nutrients to carry it through the entire growing season.
If you fertilize lavender plants too late in the year, the new growth may not harden off before winter and could be damaged by cold.
In warmer climates, you can fertilize lavender plants again lightly after the first bloom flush, but this is optional.
3. Apply Fertilizer Away From the Stem
When you fertilize lavender plants, never pour fertilizer directly at the base of the stem.
Lavender has shallow roots that sit close to the surface, and direct contact with fertilizer can burn them.
Instead, sprinkle granular fertilizer in a ring around the plant, about 4 to 6 inches away from the stem.
If you use liquid fertilizer, dilute it to half strength and water it into the soil around the drip line, not on the plant itself.
4. Water Lightly After Feeding
After you fertilize lavender plants, water the soil lightly to help the nutrients settle in.
But be careful not to overwater, because lavender hates soggy roots.
Let the soil dry out between waterings, and never let your lavender sit in standing water.
Good drainage is just as important as knowing how to fertilize lavender plants.
When Not to Fertilize Lavender Plants
There are times when you should skip fertilizing lavender plants altogether.
If your lavender is already growing in rich, loamy soil, it may not need any fertilizer at all.
You should also avoid fertilizing lavender plants in late summer or fall, because this encourages tender new growth that will not survive the winter.
And if your lavender looks yellow or weak, do not assume it needs more fertilizer.
Yellowing is often a sign of overwatering or poor drainage, not a lack of nutrients.
1. Skip Fertilizer in Poor Soil
Lavender actually performs best in poor, gritty soil.
If your soil is sandy or rocky, your lavender may never need fertilizer at all.
In that case, simply adding a little compost around the plant is enough to keep it healthy.
2. Avoid Fertilizing Newly Planted Lavender
When you first plant lavender, do not fertilize it right away.
Give the plant a few weeks to settle in and establish its roots before you even think about feeding it.
Once it shows signs of new growth, you can fertilize lavender plants lightly the following spring.
Signs You Over-Fertilized Lavender Plants
If you fertilize lavender plants too much, the plant will let you know.
One of the first signs is excessive leafy growth with very few flowers.
The plant may also become floppy and lose its compact, bushy shape.
In severe cases, over-fertilizing can cause root burn, which leads to yellowing leaves, wilting, and even plant death.
If you suspect you have over-fertilized, stop feeding immediately and flush the soil with water to wash away excess nutrients.
Then let the soil dry out completely before watering again.
So, How to Fertilize Lavender Plants?
To fertilize lavender plants, feed them lightly once in early spring with a low-nitrogen or balanced fertilizer, apply it away from the stem, and water gently.
Lavender is a low-maintenance herb that does not need much feeding, and too much fertilizer will do more harm than good.
By following these simple steps, you can fertilize lavender plants the right way and enjoy healthy, fragrant blooms season after season.