If "basil" returns aggressively each year, spreads rapidly, and has serrated leaves with a distinct anise/cinnamon scent, it's likely perilla (Perilla frutescens), also called shiso or beefsteak plant. True basil (Ocimum basilicum) is an annual that doesn't self-sow aggressively in temperate climates.
| Feature | Perilla (Shiso) | Basil |
|---|---|---|
| Life cycle | Annual, prolific self-seeder | Annual, limited self-sowing |
| Leaf margin | Deeply serrated | Smooth or slightly toothed |
| Stem | Square, often purple-tinged | Square, green |
| Scent | Anise, cinnamon, minty | Sweet, clove-like |
| Flower | Small, white/pink, dense spikes | White, whorled spikes |
When perilla is intertwined with Japanese maple, iris, peony, or rose, hand-pull carefully. Avoid herbicides near valued plants. Mulch heavily after removal.
Confirm ID at a local nursery or extension office before large-scale action.
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