Do Tomatoes Like Mushroom Compost?

Do Tomatoes Like Mushroom Compost

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Tomatoes are a favorite crop among gardeners, from beginners to the experienced. Tomatoes grow easily without many intense demands on the gardener and produce a good yield if their basic requirements are met. Is mushroom compost good for growing tomatoes, and will it benefit the plant and the fruit?

Tomatoes can benefit from mushroom compost due to the improvement of soil structure and the balancing of pH levels. Care must be used due to the alkaline nature of mushroom compost and its salinity. A recommended maximum of 20% mushroom compost is recommended for growing tomatoes.

Mushroom compost has many benefits for a variety of garden vegetables, but does this include tomatoes? While tomatoes are easy to grow, they still need a certain environment to optimize their growth. Does mushroom compost satisfy these requirements, or will it harm their growth?

Can You Grow Tomatoes With Mushroom Compost?

Tomatoes are a firm favorite for home vegetable growers because a few plants produce enough tomatoes for a family and the plants are relatively forgiving in the conditions they like for growing.

Mushroom compost is beneficial as a soil amendment when the pH of the soil needs to be increased to a more suitable range for growing certain plants. Other benefits of mushroom compost include increased drainage, better water retention, higher calcium levels, and good weed suppression.

The aspect of mushroom compost that can cause problems for certain plants is the high salt levels in the compost and the high alkalinity.

How do these benefits and drawbacks affect growing tomatoes in mushroom compost? To find out whether mushroom compost is a good idea for tomato growing, we need to consider the ideal growing environment for tomato plants.

Does Mushroom Compost Provide Good Soil For Tomatoes?

Tomatoes are moisture-loving plants that perform best when they are not allowed to dry out completely, especially during their fruiting phase.

Even though tomatoes require a lot of water, they are very susceptible to root rot if they are rooted in poorly drained soil or if their roots are left in standing water for a time.

Mushroom compost benefits tomatoes because it introduces organic material to the soil, improving drainage and increasing water retention. The increased air spaces in the soil provide breathing space for the tomato plant roots and excess water in the soil to drain into deeper layers.

At the same time, the organic material acts as a sponge and retains moisture in the soil without the soil staying too wet and causing root rot. This provides an ideal growing medium for tomatoes that will benefit their growth.

Even though mushroom compost improves the soil structure, there are other aspects to the compost that require it to be used with caution and restraint for growing tomatoes.

Is The Salt Content Of Mushroom Compost Good for Tomatoes?

One of the dangers of mushroom compost is the high salt levels, which can be detrimental to the health of some plants.

Tomato plants are moderately salt tolerant, which means they can withstand the saltiness of mushroom compost if used in moderation.

Because tomato plants are only moderately salt tolerant, you should keep your mushroom compost to soil ratio to a maximum of 20% mushroom compost to 80% soil to keep the salinity within tolerable levels for the tomato plant.

Is The Alkalinity Of Mushroom Compost Good For Tomato Growing?

Mushroom compost is used as a soil amendment to improve soil structure, drainage, and moisture retention and as a pH adjuster.

This aspect of mushroom compost calls for some judicious use of the compost when growing tomatoes.

Tomatoes typically prefer a slightly acidic growing environment, with a pH range of between 6.2 and 6.8. 

Mushroom compost typically has a pH of 6.6 or 6.7, which is in the upper range limit of the best pH range for growing tomatoes. Adding too much mushroom compost to a growing medium for tomatoes can push a pH beyond the optimal range for growing tomatoes, making the soil too alkaline.

Where adding mushroom compost will benefit tomatoes is where the soil pH is on the lower end of the best pH range for growing tomatoes. The roots of tomato plants exude enzymes that tend to increase the acidity of the soil.

If the soil is already acidic, this can further increase the acidity and cause the tomato plants to suffer. Mushroom compost is beneficial in this instance because it will raise the pH to be in the optimal range for the plants.

Does Mushroom Compost Provide Good Nutrition For Tomatoes?

Mushroom compost is lower in nitrogen levels than other forms of compost, which is an advantage for growing tomatoes.

High nitrogen levels in compost promote lush, leafy growth but discourage the plant from flowering and fruiting. The comparatively low nitrogen in mushroom compost gives the plant enough of the nutrient but not so much that flowering and fruiting are reduced.

Mushroom compost is rich in calcium, which is an important mineral for plants that produce large, fleshy fruit, such as tomatoes. High calcium levels promote sturdy plant growth to support the heavy fruit and contribute to stronger, healthier fruit that is less likely to bruise or rot prematurely.

The high salt content of mushroom compost is a good weed deterrent, especially when used as a mulch. Suppressing weed growth is good for the tomato plant since the weeds would use nutrients intended for the growth of the tomatoes.

However, mushroom compost used as a mulch for tomato plants should be used in moderation to prevent adding too much salinity and alkalinity to the soil.

Can You Grow Tomatoes In Mushroom Compost Alone?

Mushroom compost should not be used as the sole growing medium for mushrooms. It should be used as an additive to the soil used to grow tomatoes.

Using mushroom compost by itself will result in too much salinity and potentially too high pH levels to promote healthy growth in the plants.

Whether planting tomatoes in a container or directly in the soil, the maximum mushroom content in the growing medium should be 20%.

Check out: Coffee Grounds For Tomato Plants


Tomatoes like mushroom compost if it is used in moderation in the growing environment. The tomato plants benefit from improved soil structure, pH amendment, and the high calcium levels in the mushroom compost that help with fruit production.

Too much mushroom compost can be detrimental to tomato plants by making the soil too alkaline and exceeding the moderate salt tolerance of the tomato plants.


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