If you’re wondering “Which plants like wood ashes?” then you already know that many gardeners swear by the awesome benefits wood ash gives plants, even better than traditional lime. If you did not know, spreading this cheap product around your plants can definitely up your gardening game.

Plants that Love Wood Ash

Wood ash has plenty of nutrients, including potassium, iron, calcium, phosphorous, magnesium, manganese, boron, zinc, and chromium. All of these nutrients contribute to the well-being of your plants, so let’s dive into a list of the plants that absolutely love this add-on. 

List of Plants That Enjoy Wood Ashes

1. Roses 

Roses require a rich substrate to grow well. Wood ash is a fantastic fertilizer with ample phosphorous, calcium, nitrogen, and potassium concentrations. These nutrients help the soil promote an abundance of flower production. They also help the roots and stems grow strong throughout all the seasons.

Rose Flower  

– Best Soil for Roses

The best soil for roses is one that has a pH that lies between 6.0 and 7.0. If the soils are too acidic, they may increase root rot or stunted growth. If the soil is too alkaline, avoid adding ash as the basic pH prevents them from taking up the nutrients. If you add too much ash, you must correct the pH levels by adding peat moss or sulfur to stabilize the soil.  

– Best Time to Add Wood Ash

The best time to add ash is just before the peak growth season begins in the spring or early summer. A fresh dose of potassium allows the blooms to last much longer than normal. Once the growth period season is over, keep the ash the same. Adding ash at this time will promote untimely growth that consumes the plants’ nutrients before the winter season.  

2. Lavender 

It is possible to find lavender in every garden across the globe. Many grow it for its fragrant foliage, colorful inflorescences, and hardy shrubs. 

Purple Lavender

The need for lavender essential oil has sparked the debate about using natural fertilizers to minimize production costs and ecological impacts. This is why ash is a great addition to your soil; it’s natural and organic. 

– The Best Soil for Lavender 

Lavender prefers to grow in alkaline soil. A liming agent is needed to raise its pH to a good alkaline level. Wood ash comes in handy as it’s more reactive than agricultural lime. You can apply it at higher concentrations to increase the alkalinity, and it will create a better environment for lavender roots and protect the plant from diseases and pests. 

– When to Apply Wood Ash 

Apply ash annually at the start of the growing season, around spring, after the soil warms up. Apply it around the base before the new shoots come up. You can mix it with a little bone meal to make it more effective for new growth. Provide your lavender plant with ample sunlight so the ash works effectively after application.   

3. Arugula 

Arugula is an herb that is slightly bitter but has high nutritional value. It is deeply lobed with bright green leaves and small white to purple-veined flowers. The leaves are a great addition to Mediterranean-style pizzas and salads. 

Arugula Plant

They are rich in calcium, magnesium, and manganese. These elements should be present in the soil or substrate where the arugula plant grows. This is where wood ash comes in to provide these critical nutrients to the leaves. 

– Best Soils for Arugula 

Arugula roots thrive in neutral to slightly alkaline growth medium. Wood ash helps raise the pH levels to a neutral value, thus helping maximize nutrient availability and absorption. You can use ash with other mineral fertilizers if you grow your herbs in an aquaponics setup.

– Best Time to Apply Wood Ash 

When growing arugula, you can apply ash regularly as a topsoil conditioner to ensure potassium is readily available for the plant. A change in weather easily destroys arugula shoots that are deficient in potassium. If you grow arugula in vegetable patches, ash will help keep pests away from arugula leaves. 

4. Basil 

Basil is a tender perennial plant that is a must have in any herb garden. This fragrant plant is cultivated in various ways, from vertical gardens to hydroponic setups. Whichever method you use, ensure you produce high-quality basil leaves that you can sell anywhere or consume yourself.

Basil Plant

Basil is a popular herb to grow because of its many culinary uses. You can find basil in almost any grocery store or market, and lots of people also grow their own basil leaves at home for optimal freshness.

– Best Soils for Basil

Basil thrives in slightly acidic to neutral conditions ranging from 6.5 to 7.5. However, in aquaponics, you may need a slightly higher pH. If your soils are too acidic, adding ash naturally raises the pH.

When adding ash to your soil, stick to a conservative amount, ensuring you test the pH after every addition. Use a trowel to work the ash at least six inches deep into the soil. Once the pH is around 6.5, stop adding ash. The same process can be applied to both Thai and Holy basils.

– Best Time to Add Wood Ash 

The best time to add ash to your soil is at the beginning of the growing season, ensuring that you test the soil’s pH before and after application. Ash helps deter insects that love to chew on the vegetative parts of the plant. The ash strips their bodies of moisture, causing them to dry out and die. 

5. Common Sage 

Common sage is a perennial herb that has many attractive varieties. It is grown for its ornamental and culinary appeal. Its fleshy, fuzzy foliage is grey to light green, though some cultivars have purplish undertones. The leaves are rich in many phytochemicals that compose a high-value essential oil. 

Common Sage

– Best Soils for Common Sage

Sage tolerates strongly acidic to slightly alkaline soil conditions. The pH range for best growth is 6.0 to 7.0. Wood ash helps stabilize the soil to the near-neutral range, providing minerals and nutrients to hasten the production of leaves. It also induces higher flowering and seed production.

– Best Time to Apply Wood Ash

The best time to apply ash is during the active growing stage. This results in a steady growth rate for your sage. Ash is a milder fertilizer compared to other synthetically produced fertilizers. Apply it in controlled amounts to provide the necessary nutrients without drastically increasing its growth rate. 

6. Tomato 

Tomato is one vegetable that will benefit from the application of wood ash. The ash composition prevents tomatoes from becoming calcium deficient. It also increases the crop yield, improving tomato fruits’ color while keeping them strong and green. The same solution can be applied to pepper plants that have a calcium deficiency.

Tomato Vegetable

Tomatoes are a well-loved kitchen staple all over the world. The juicy meat and bright orange color of this fruit makes it a delight to eat. A lot of cuisines make use of tomatoes in their dishes, and some even make this bright vegetable the star of the show.

– Best Soil for Tomatoes

Tomatoes enjoy growing in slightly acidic soils. If your soil or substrate is overly acidic, your tomato plants are less likely to absorb nutrients. Gradually adding ash helps prevent drastic spikes in the pH levels. Wood ash neutralizes the soil faster because it is soluble in water compared to agricultural limestone. It is also less likely to raise the pH range to dangerous levels. 

– Best Time to Apply Wood Ash

If you want to use ash for your tomato garden, apply it once during the active growing stage. Apply it once the morning dew or excess moisture has evaporated so it does not get wet.

Ash is effective in deterring pests when dry and should be sprinkled around the bottom of the plant and not on the leaves or stems. If sprinkled on the leaves or stems, it may damage the plant’s epidermal tissues or compromise the photosynthesis rate.

7. Phlox 

Phlox is a beautiful perennial plant that likes to create stunning pastel-colored inflorescences. This plant has simple flowers that produce an alluring fragrance, attracting many pollinators. The sticky stems of phlox grow to a maximum height of three feet. The blooms can form a waist-high carpet in mid to late spring. 

Phlox Plant

– Best Soils for Phlox

This plant thrives in USDA hardiness zones three through eight. It prefers neutral pH levels and highly dislikes overly acidic or sour substrates

To keep the soil neutral, it is important to add ash to prevent the pH levels from dropping. It highly benefits from organic fertilizers including compost, peat moss, bio humus, and wood ash. These organic fertilizers enhance the production of large and more densely packed flowers. 

– Best Time to Apply Wood Ash

Wood ash is best applied regularly during this plant’s active growing stage to maintain a desirable pH level. Phlox greatly benefits from potassium, which helps increase the hardiness and resistance to diseases. It also helps prolong the longevity of blooms.

8. Sweet Cherry 

Sweet cherry requires perfect soil conditions throughout its peak growing period to produce maximum yields. Productivity is largely affected by the pH levels in the soil. Cherries are a popular fruit to grow and consume all over the world.

Sweet Cherry

– Best Growing Conditions for Sweet Cherry

Cherry trees thrive under full sunlight and good circulation. The substrate around the roots should always be well-draining, fertile, and deep. They also prefer slightly acidic to moderately alkaline pH in the soil. Whenever your soil pH levels drop to below six, ash always comes in handy. 

You can amend your soil even before the pH level drops or until it measures close to neutral. The potassium in wood ash helps this tree produce more flowers and high-quality fruits. Flower and fruit production uses a significant portion of the plant’s nutrients. In some cases, it might be wise to fertilize your plant to ensure its proper health.

– Best Time to Apply Wood Ash

The best time to apply ash is when the tree is at its peak growth period for older trees and during planting time for new trees. Ash helps increase fruit production and prevents root rot due to poor drainage.  

9. Big Leaf Hydrangea 

Bigleaf hydrangea is known for its large, bright green leaves with bouquet-shaped inflorescences. This ornamental plant is stunning, with magical quality flowers. 

Big Leaf Hydrangea