Slovak gardeners warned about walnut allelopathy and taught mint freezing methods

Walnut trees (Juglans regia) common in Slovak gardens release a natural compound called juglone, which, together with dense shade and extensive root systems, can slow or halt the growth of nearby plants. Sensitive species include tomatoes, potatoes, peppers, rhododendrons and azaleas, while many ornamental plants such as hostas, ferns, snowdrops, crocuses and others tolerate the conditions. Fallen walnut leaves decompose slowly; if composted for one to two years they become safe for garden use.

Mint, a popular herb in Slovak gardens, can be preserved by freezing to keep its aroma and flavor for several months. Leaves should be dried, packed in airtight containers or ice‑cube trays, and stored at –18 °C, where they retain quality for about three to six months. Frozen mint is suitable for cooking, sauces, soups, lemonades, syrups and even refreshing mint‑lemon spaghetti. People with acid reflux should consume it cautiously, as mint may aggravate symptoms.