How to use potato peelings as fertilizer: for which plants, for flowers

Seasoned gardeners are no strangers to making the most of their kitchen scraps. Potato peelings, often overlooked, are an eco-friendly treasure trove for nourishing gardens. This guide dives deep into the benefits of potato peel fertilizer, its composition, and its versatile uses.

Potato Peels: More than Just Waste

While many discard potato skins without a second thought, their nutritional profile is impressive. Not only are they packed with vitamin C, enhancing the ascorbic acid content of berries, but they also offer a range of other benefits for plants:

  • Starch – Acts as a growth booster for plants. Plants like currants and roses thrive with it.
  • Organic Acids – Facilitate smooth oxidative processes, enhancing carbohydrate digestion and absorption in plants.
  • Glucose – Vital for protein synthesis and ensuring energy levels during colder months.
  • Mineral Salts – Integral to plant health, a deficiency can compromise a plant’s natural immunity.

Why Your Garden Loves Potato Peels

Potato peels cater to a garden’s diverse needs:

Natural Nutrition – The inherent starch fuels plants throughout their growth phase.

Pest Magnet – While not exterminating pests, the peels attract them to a singular spot, making them easier to manage.

Subtle Heat Source – As they decompose, potato peels release warmth. It might be minimal, but it’s adequate for nurturing plant growth.

Economic and Eco-friendly Fertilization

The best things in life are often free. With potatoes being a staple in many diets, a significant portion of it ends up as waste. Repurposing these peels as fertilizer not only saves money on garden nutrients but also promotes sustainability.

These potato peels are a green gardener’s dream: devoid of harmful nitrates and pesticides, and their application doesn’t require meticulous measurements. Overdoing it won’t harm your garden, making it a worry-free, organic solution for budding plants.

Which Plants Benefit Most from Potato Peel Fertilizer?

Practically every plant in your garden can benefit from the nutrient-rich potato peelings. Starch and glucose, present in these peels, are especially crucial during a plant’s growth phase. This organic nutrient boost is especially beneficial for berries like currants, raspberries, strawberries, as well as melons and squashes. But the benefits don’t stop with edibles; even ornamental plants and indoor blooms can thrive with this treatment.

Preparing Peels the Right Way

Fresh peels are a no-go! Using them raw can invite rot, pests like rodents, and even plant diseases.

There are two trusted ways to prep peels:

1. Drying:

Spread the peels thinly in a breezy room for up to 10 days. Alternatively, oven-drying at 100°C for a few hours works too.

2. Freezing:

Make sure the peels are pristine and dry, then pop them in the freezer.

Freezing has the edge when it comes to nutrient preservation. However, dried peels win in terms of shelf-life and ease. Do note: once thawed, frozen peels should be used immediately and never re-frozen.

How to Craft Your Potato Peel Fertilizer

Firstly, wash and dry the peels well.

There are a few tried-and-tested methods to transform potato waste into plant food:

1. Infusion:

Ideal for indoor plants and berries. Cover your peels with boiling water, and let them sit for a day. Use half the amount of dried peels compared to frozen.

2. Mash:

Use only dried peels. Submerge them in boiling water in a deep container and let sit for about a week. Afterward, stir to get a pulp-like consistency.

3. Powder:

Grind the peels finely using kitchen appliances like meat or coffee grinders. Once ground, steep the powder in boiling water before use.

4. Compost:

This is a long game, taking up to 18 months to create a mild fertilizer. Accelerate the process by frequently turning your compost pile or enhancing it. Keep a keen eye on the nitrogen-to-carbon ratio. Fresh peels add nitrogen, while dried ones are a carbon source. Ideally, aim for 25% nitrogen and 75% carbon, and remember to aerate your pile every few days.

A Tip to Remember: Fresh potato peels boost nitrogen in your compost, while dried peels add carbon.

With these guidelines, turn your potato peel waste into a garden treasure, ensuring your plants stay nourished and flourishing.

Guidelines for Using Potato Peel Nutrition in Gardening

Optimal Timing for Fertilization

Fall is the ideal time for organic fertilization, particularly post-harvest. During the cold months, the organic matter will naturally decay, infusing the soil with vital nutrients.

For Young Plants

For sprouting plants, a mixture of potato-based flour or mash proves beneficial. Begin by adding a modest amount of the feed into the furrow, which should then be covered lightly with soil. Repeat this layering process before positioning the saplings. This ensures that young plants receive the essential nutrients for growth.

For Vine Fruits

For vine-bearing fruits like pumpkins, squashes, and cucumbers, potato mash-based nutrition is invaluable. When planting, add the mash to the base of the planting hole, cover with a layer of soil, add another round of fertilizer, and finally top up with soil before placing the sapling. Regular watering with potato-infused water can enhance plant growth and eventual yield.

For Rooted Vegetables and Alliums

For veggies like carrots, as well as onions and garlic, a potato-infused liquid feed is recommended. From late May, water the plants bi-weekly, ensuring each plant receives direct root nourishment. Be vigilant to not leave potato remnants on the soil; it could attract unwanted pests.

For Berries

Berries, such as raspberries, strawberries, and currants, can be fed twice annually – during spring and fall. Due to the starchy nutrition, the fruits tend to be more flavorful and sizable. For quick absorption, introduce the fertilizer close to the roots. Strawberries, however, have a different regimen: bi-weekly, drench them in potato powder or directly water their roots with the potato infusion.


Potato scraps can be a boon for your compost, catalyzing the decomposition process. However, ensure the peels are sourced from healthy potatoes to avoid the growth of harmful fungi.

Pest Deterrence

A potato-based nutrient mix can act as a deterrent for pests. Fresh peel traps can be set up to attract and trap pests like slugs or beetles. Regularly inspect, dispose of the pests, and refresh the traps as needed.

For Houseplants

Craft a solution from potato peels and boiling water in a 1:10 ratio. Once cooled and sieved, this can be used on houseplants, typically once a month.

For Blooms

The same solution used for indoor plants can be applied bi-weekly to outdoor ornamental plants. This feed is particularly beneficial for plants with tuberous growth patterns, such as tulips and begonias.

For Trees

For fruit-bearing trees, prepare a potato mash, mix it with warm water, and let it sit for several days. Before applying, loosen the surrounding soil. Then, embed the mixture approximately 20 cm around the tree trunks.

Tips for Storing Potato-Based Fertilizer

While potato-based fertilizers are abundant, it’s not as straightforward as stashing the waste away in any container.

For dried potato waste, it’s best to keep them in paper or fabric sacks in a place that is dry and boasts good air circulation. Periodically, it’s advisable to inspect the stash for any signs of insects or other undesirable elements.

If you’ve chosen to freeze the peels, they should be stored in the freezer or a chilly cellar. Ensure they remain frozen until you’re ready to use them, as they can decompose quickly once thawed.

When Not to Use Potato Peelings as Fertilizer

While potato peels can be a great organic fertilizer, they aren’t universally ideal for all plants. Specifically, avoid using them for nightshade plants like peppers, tomatoes, and eggplants. The reason is that these plants share many diseases with potatoes. No matter how thoroughly you dry or treat the peels, there’s always the possibility that they might carry harmful bacteria.

Final Thoughts

Understanding which plants can benefit from potato peel fertilizers can be invaluable for a gardener. With a slew of benefits and virtually no downsides, it’s no wonder this natural fertilizer is gaining traction among gardening enthusiasts.

Leveraging potato peels as fertilizer not only enhances soil health and boosts produce yield, but also offers an eco-friendly and cost-effective alternative to chemical fertilizers.