Are Coffee Grounds Good for Hostas?

Yes, coffee grounds are good for Hostas if used properly. It’s high in acidity, and only a few types of houseplants enjoy coffee.

Hosta is a beautiful plant that has large leaves, which make them even more pretty. Also, they have a lovely aroma with texture on leaves and, beautiful colours with some varieties. Moreover, they are untroublesome, low-maintenance plants that are simple to grow.

When coffee grounds used as mulch can benefit the Hostas plant as coffee grounds are high in nitrogen.

You need to use it carefully as mulch, but using it too much can damage your Hostas plant. Hostas may develop a layer or coating that will prevent water and air from getting into the roots.

If you brew a cup of coffee, don’t waste it instead, use it in your garden as mulch. They are a pure supply of nitrogen and can improve your soil if used carefully. 

Nutrients Hostas Need to Grow

For Hostas to reach their greater sizes depends upon the nutrients that can help them to thrive well. Although they require relatively little upkeep but lacking nutrients can cause problems for Hostas. Either they experience stunt or poor growth.

Slow-release fertilizer needs a diversified microbial population to give its nutrients, which are best acquired from compost. 

Chemical fertilizers have the quickest observable benefits because they operate quickly, making nutrients readily accessible to plant roots. 

It’s an inexpensive fertilizer and can be affordable. Taking proper care while using it can become a great option for your Hostas.

Are Coffee Grounds Good for Hostas?

Coffee grounds are useful for Hostas when utilised rightly. Coffee grounds can be used as mulch in Hostas plants, but that doesn’t mean to be, throwing it all over your plant. 

Coffee grounds can have negative impacts too, as using them incorrectly can perhaps kill your Hostas plant.

  1. Coffee grounds are high in nitrogen content, that’s why Hostas get benefits from them. Along with nitrogen, Hostas needs phosphorus, and potassium to maintain good health and to thrive well. 
  2. Moreover, coffee grounds encourage worms in the soil as worms enjoy the coffee smell. Worms enjoy consuming coffee grounds, and their digestion results in casts, which are high in nutrients that is “chelated”. 
  3. As the worms crawl through the soil plus consume the coffee grounds with that they create channels. Because they aerate the soil, lessen compaction, and give the hosta’s roots room to spread out and establish, these channels are beneficial to the plant. The hostas will be more resilient to dry circumstances as a result of the ability of the roots to grow deeper and access moisture reserves deep in the soil.
  4. Worm-created channels improve the soil’s ability to drain. Although hosta roots prefer damp soil, they do not enjoy slow-draining, waterlogged soil. Because there are more channels and spaces in the soil, surplus water can drain away from the roots instead of sitting in water which can lead to fungus disease.
  5. Hostas also need soil that is between a pH of 6-7, or moderate acidity to pH neutrality. Although the pH of fresh coffee grounds might vary quite a bit, once they have completely decomposed, they will fall into the ideal range for hostas, with a pH of 6.5 to 6.8.

Also Read: How Often to Water Peace Lily in Winter?

Nutrients in coffee grounds for plants

In addition to numerous micronutrients, coffee grounds also include some vital nutrients like potassium, phosphorus, and nitrogen. Choosing coffee grounds can be a good choice while using it with good knowledge. 

  • Many people utilize their coffee grounds as fertilizer by dumping them directly into the ground. Coffee grounds will not instantly add nitrogen to your soil, but they will add nitrogen to your compost. 
  • The advantage of utilizing coffee grounds as fertilizer is that it increases the amount of natural material in the soil, which enhances aeration, drainage, and water retention. 
  • In addition to attracting earthworms, spent coffee grounds will promote the growth of microorganisms that are good for plant growth.

How can you use coffee grounds for hostas?

Hostas thrive when they are mulched at the beginning of spring. Mulch should ideally enrich the soil with nutrients, retain moisture, control weeds, and enhance soil structure. 

  • You can use coffee grounds for Hostas by combining them with compost and spreading a two-inch layer around the hostas. This can help to maintain moisture, provide nutrients to the soil and maintain healthy soil too. Also, coffee grounds can kill slugs and snails, but they are not a reliable method to stop slugs from devouring hostas.
  • It’s vital not to apply too much at once. Coffee grounds can be directly added to the hosta’s soil. It only takes one application of a thin layer, roughly half an inch thick. At the beginning of the growing season, with the help of coffee grounds and compost, your hostas will get a boost of nitrogen from it.
  • If you want to use fresh coffee grounds on your Hostas then your coffee should be brewed. Compost the coffee grounds while your ground is cool. Mix the compost once your grounds have been composted.
  • For optimal water retention and to keep the soil surrounding hosta roots moist throughout the drier summer months, mulch should be applied at a depth of 2 inches.
  • Coffee grounds can harden into a crust that prevents water from penetrating and deprives the roots of oxygen if you put too many coffee grounds in a thick layer.
  • In addition to coffee grounds, compost, leaf mould, and manure are also excellent things to add because they all have a remarkable potential to hold onto moisture, which is necessary for healthy hostas.
  • Also, these components decompose into a friable porous structure that will unite well with the coffee grounds to create the ideal conditions for hosta growth by ensuring proper drainage, aerated soil, and a healthy dose of nitrogen.
  • Coffee grounds are brown in colour but regarded as green in a composting manner and can be balanced with brown materials like shredded paper, dead leaves and more in your compost pile.

Check this out: Is Bone Meal Good for Hostas?

How does coffee grounds affect plants?

The main thing you need to understand is that not all houseplant needs coffee grounds in the soil. Treating all houseplants, in the same manner, is not good to do so. Coffee grounds are high in acidity, and only a few houseplants can enjoy them. 

Insects and other animals may be drawn in by the components in coffee.

Given that your garden is indoors and not outdoors, this may not be a major issue, however, if you left your window open, you risk having some unexpected insects sticking out in the pot of your houseplant.

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Myths about using coffee grounds for houseplants

There is a myth that all houseplants like coffee grounds but that’s not correct, as it can harm them.

Only a few houseplants can do well in coffee grounds because they need it. One of the main causes that coffee grounds can do is it can burn the leaves as they are high in level of nitrogen.

Also, it can make the soil excessively acidic for most plants and promote the growth of fungi. So, you don’t have to use coffee grounds in all houseplants.

Coffee grounds can be helpful to some houseplants when used as compost, mulch or fertilizer. Giving too much coffee grounds can prevent your plant to grow well.

Plants Grow Better When Coffee Grounds Are Used. This may be true or maybe not. Using coffee grounds as mulch can surely helps plants.

However, any mulch can do that. Also, it is a slow fertilizer that can be beneficial to plants. As already mentioned above, Coffee grounds are good when used in the right plant, who needs it. Using it in any houseplant can cause only harm.

So, examine your plant first and then take further steps.

Also Read: Can I Use Cactus Soil for Peace Lily?


Using coffee grounds for hostas plant directly isn’t recommended, as it can attract pests if left unchecked.

Instead, you can add leftover coffee grounds to your compost bin. Though it might not show great impact on your garden instantly, it will add macro nutrients to your compost.

If you begin the feeding then, keep an eye for it and if any changes you might see, take appropriate actions against it. If the plants’ leaves start to turn brown, curl, or wilt, reduce or discontinue your use of coffee.

Coffee grounds can have different impacts and levels of effectiveness depending on how you utilize them. It can depend upon the gardener’s use as to how can they utilize it. It can be advantageous or harmful depending upon how you can use it or in which plant. 

Take proper knowledge and implement it. First, use the coffee grounds in a limited way to test it.