5 Causes Why Brunnera Jack Frost Leaves Turning Brown?

The colorful foliage of the Brunera Jack Frost plant indicates its natural growth. So if you suddenly notice that your plant’s leaves are turning brown, that is indeed a warning sign. 

Jack frost leaves can turn brown for a number of reasons. Among them Poor Soil, Excess Sunlight, Lack of Water, Fertilizer Burn and Pests are quite common.

To fix this plant quickly, you need to know more about these causes and find solutions. But no worries. In this article, I have discussed all the problems and their Control Measures in detail for you. So keep scrolling to stay with me.

Quick care guide

Problem Solution 
Poor SoilMoist and well-drained soil is recommended.
Excess Sunlight6 hours of full sun, 3 hours of partial sun and the rest of the time full shade is required.
Lack of WaterFrequency is recommended.
Fertilizer BurnUsing organic compost is safer.
PestsGood-quality insecticides are recommended.

How to Fix Brunnera Jack Frost Brown Leaves?

Fixing Brunnera Jack Frost Brown Leaves

1. Poor Soil Conditions

Soil is very important for Brunera Jack Frost plants. How much your tree will grow, and how fresh it will depend on what kind of soil you use.

If you plant your brunnera in soil that does not hold enough water and is always dry, the plant will not get enough water when it needs it. As a result, the leaves of the plant will dry and turn brown due to dehydration.

Again if your soil pH is too high or too low, the nutrients needed by plants will not be present in the soil. Such nutrient-deficient soil is never suitable for plants. As a result, problems like yellowing of leaves, browning, and falling of leaves are visible.

Control Measure

Brunera jack frost plants prefer moist and well-drained soil. The soil should be moist but not waterlogged. Again it will not stay dry. You can easily check the water holding capacity of your soil using a moisture meter (Our Pick: SONKIR Soil pH Meter, MS02 3-in-1 Soil Moisture/Light/pH Tester)

Basically, before planting the tree, the quality of the soil should be determined. But if the tree is already planted, you need to mix a lot of organic materials into the soil. I would suggest you use organic compost. You can make it yourself using various organic materials in and around the house.

You will need to make a few small holes in the bottom of your pot to ensure adequate drainage. A mixture of bark, peat, and perlite is very effective in making soil. The pH range will be 5.5-6.5. You can easily check this with a pH meter.

2. Overexposure to Sun

If you want to keep your Brunera plant exposed to sunlight all day then this is the most dangerous decision.

Excess sunlight disrupts the photosynthesis process of Brunera plants. As a result, the plant cannot produce enough food for itself.  

As this process occurs in the leaves, the leaves initially droop and dry up and turn brown. Later the stem gradually bends and the whole plant falls to the ground.

Also, if exposed to the sun throughout the day, the soil of the plant dries easily, so the plant always needs water. And if you don’t water frequently, your plant’s leaves will turn brown.

Control Measure

Brunera jack frost plants require proper planning for sunlight exposure. Since the plant prefers both full sun and shade, you can give it six hours of full sun, three to four hours of partial sun, and the rest of the time full shade.

To get full sun, you can place your plant where it will receive morning sun. It can be the east-facing window of your house or sunshade. For the next three hours of partial sun, move the plant to a location that receives warmth but not direct sunlight.

However, if your tree is in the landscape, you should use a shade cloth to ensure full shade. When using shade cloth I always prefer colors that do not absorb heat. You can use green.

3. Lack of Water

If your Brunnera leaves continue to turn brown despite ensuring good-quality soil and adequate sunlight, you need to think about watering.

If you apply water to the plant in an incorrect cycle, your plant will not get enough water when it needs it. As a result, the roots of the tree will begin to dry. 

Even if water is applied later, the plant will not be able to absorb the water from the soil as the roots become inactive. As a result, problems like the browning of leaves, the appearance of holes in leaves, and the falling of leaves occur. 

Also, during the dry season when the plant’s water needs are greatest, plants can die quickly without an adequate supply of water.

Control Measure

Newly planted Brunera Jack Frost should be watered regularly until mature. Special attention should be paid to them during the summer season.

Since Brunera Jack Frost prefers moist soil, you will need to water them frequently. However, waterlogging cannot be created. The soil should be checked before each application of water. 

You can follow an easy method for watering. First Apply water thoroughly. Before the second application of water, A 2.5-3 inch stick should be inserted deep into the soil. If half of the stick is wet then water can be applied.

To avoid the disturbance of repeated watering, you can cut a portion of a thick sack and soak it in water. Then keep the wet part around the base of the plant. This will ensure that your plants are always exposed to moisture.

4. Fertilizer Burn

Fertilizer burn is one of the causes of the browning of Brunera plant leaves. Many beginners think that the more fertilizer applied to the tree, the faster the tree will grow. But the reality is, every nutrient has a certain limit. Exceeding it causes toxicity to the plant.

If you over-fertilize your plants, excess salinity will disrupt your plant’s normal biological processes. As a result, the tree will quickly burn, turn brown and even die.

Take a good look at the base of the plant if there is unabsorbed fertilizer, then the problem is definitely due to the over-application of fertilizer.

Control Measure

Brunnera Jack Frost usually doesn’t need a lot of fertilizer. It is best to apply organic materials and organic compost. You can easily make good quality organic compost at home.

For this, you will need eggshells, tea leaves, cow dung, curry leaves, cardboard, unused newspaper, etc. First put the curry leaves, egg shells, tea leaves, and cow dung together in a medium pit. Then cover the hole with newspaper. After two weeks it will be usable and should be used with the soil during soil preparation.

But you can apply a small amount of fertilizer during the growing season. In that case, nitrogen-rich fertilizers should be used. Liquid iron fertilizer can be sprayed if plants show chlorosis.

5. Pests and Disease

Aphids on Brunnera Jack Frost Leaves

Aphids and slugs are common causes of browning leaves on Brunera jack frost plants.  Aphids are usually 1-6 cm long. They are pear-shaped and of various colors. A slug looks like a large worm and has a trunk.

Aphids attack in groups and dehydrate the plant by sucking liquid from the leaves. As a result, the leaves start turning brown. Slugs defoliate the leaves, causing the plant to fail to produce enough food and the leaves to turn brown.

Control Measure

If the attack of aphids is mild then freshwater should be sprayed in the morning and afternoon. A mild level of aphid infestation can also be controlled by mixing two teaspoons of baking soda in half a liter of water and applying it to plants. 

But if the infestation is more widespread then a good quality insecticide must be used.

Slug attacks are quite deadly. So to remove slugs you must first find their habitat. If the habitat is destroyed, they are easily exterminated.  

But using copper tape also gives good results. There are also parasites called nematodes that attack slugs. Applying nematodes to garden soil can also help build resistance to slugs.

Frequently Asked Questions (FAQ’s)

Q: How often do you water Jack Frost?

Ans: Jack Frost plants prefer frequent watering. If you think of a time scale of 1-5, apply water to 1 and let it dry to 3. Then apply water again. However, it is convenient to use a self-watering machine for Brunera Jack Frost for frequent watering.

Q: Should I fertilize Brunnera?

Ans: Jack Frost plants do not need much fertilizer to grow. Use good quality organic compost in the soil at the time of planting. Later, for specific nutrient deficiency, fertilizer rich in that nutrient can be used.

Q: Does brunnera jack frost like wet soil?

Ans: Brunnera Jack frost only needs minimal upkeep and grows in areas with moderate shade and consistently moist but not saturated soil. They are sensitive to drought and will exhibit leaf burn if grown in a climate that is too dry.


So far I have discussed the causes of Brunnera jack frost leaves turning brown and how to fix them easily. Brunnera plant problems are a bit difficult to fix, but if you know the underlying causes, your task becomes very easy.

By taking proper measures on time and with regular care, you can easily keep your tree away from any problems. I hope my discussion helps you solve your plant problem.

Happy Gardening.

James Rivenburg
James Rivenburg
James Rivenburg

James Rivenburg is the founder of plantandpest.com, a passionate gardener with valuable experience and knowledge gained through trial and error. The website has a large community of followers who trust his tips and techniques and have succeeded with his advice. He is always Committed to helping others create a beautiful and healthy garden.

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