White Vinegar Fails as Weed Killer; Elder Tree Near Compost Signals Rich Soil

White vinegar is often promoted on social media as an eco‑friendly weed killer, but experts explain that its acidity only burns the above‑ground foliage. The plant’s root system remains untouched, allowing weeds to regrow faster after rain, especially on gravel paths where a thin soil layer traps seeds. Since 2019 the practice is classified as the use of an unauthorized pesticide in France, and the ANSES agency warns of health hazards when vinegar is mixed with bleach, citing 204 poisonings between 2001 and 2022.

The black elder (Sambucus nigra) that sometimes appears spontaneously beside compost piles is not a random occurrence. The shrub thrives in deep, nitrogen‑rich, slightly moist soils typical of well‑maintained compost. Historically, farmers planted elder near animal waste to take advantage of its preference for fertile ground. Its presence now serves as a natural indicator that the soil is rich in humus and nitrogen, confirming the effectiveness of the compost and guiding gardeners on soil health.