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Syzygium Aromaticum, What They Don’t Teach at Stanford Engineering School

by Larry Chiang on July 7, 2025


Cloves (Syzygium aromaticum) have several practical uses in gardening, primarily for pest control, soil health, and plant propagation. Here’s a concise overview based on current information:
1. **Pest Repellent**: 
   – Cloves contain eugenol, a compound with strong insect-repellent properties. Ground cloves or clove oil can deter pests like ants, aphids, and beetles. Sprinkle ground cloves around plant bases or mix clove oil (diluted with water) for a spray to protect plants without harmful chemicals.
   – Effective against garden rodents and cats when sprinkled in areas where they frequent.
2. **Fungal and Bacterial Control**: 
   – Clove oil has antifungal and antibacterial properties, useful for preventing soil-borne diseases or treating fungal infections on plants. Dilute clove oil and apply it to affected areas or use it as a soil drench to combat pathogens like root rot.
3. **Compost Enhancer**: 
   – Adding small amounts of ground cloves to compost can accelerate decomposition due to their antimicrobial properties, which help balance microbial activity. Use sparingly to avoid inhibiting beneficial microbes.
4. **Rooting Aid for Cuttings**: 
   – Clove oil or a clove-infused water solution can stimulate root growth in plant cuttings, acting as a natural rooting hormone. Soak cuttings briefly in a diluted clove solution before planting.
5. **Weed Control**: 
   – Clove oil, when mixed with water and a surfactant, can be used as a natural herbicide to kill weeds. Apply directly to weed foliage, avoiding desired plants, as it’s non-selective.
**Precautions**:
– Use cloves sparingly; excessive amounts can harm plants or soil ecosystems.
– Always dilute clove oil (e.g., 1–2% solution with water) to prevent phytotoxicity.
– Test on a small area first to ensure plants tolerate the treatment.
**Sources**: Insights from web resources like The Spruce, Gardening Know How, and posts on X highlight cloves’ role in eco-friendly pest control and soil health, though specific studies on gardening applications are limited. For detailed recipes or ratios, check gardening blogs or experiment cautiously.

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