Weeds That Look Like Arugula (and How to Tell the Difference)
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Arugula’s peppery, nutty flavor makes it a favorite in salads and home gardens. It’s good like this, tender, flavorful, and easy to grow.
However, if you notice plants that look like arugula but don’t smell or taste right, you might be dealing with weeds. And that can be risky, especially if you’re foraging or harvesting from your garden.
Common weeds that look like arugula include wild radish, shepherd’s purse, hairy bittercress, and wild mustard. These plants share similar leaf shapes but differ in smell, texture, and flower structure. True arugula has a distinct peppery scent and smooth, lobed leaves that weeds usually lack.
Keep reading to see how to tell them apart safely and how to prevent weed confusion in your garden.
Why Some Weeds Look Like Arugula
Many garden weeds belong to the Brassicaceae (mustard) family, the same plant family as arugula. Because of that, they share similar leaf structures, growth habits, and flowers.
But looks can deceive. Some weeds can grow even faster than real arugula and crowd it out. Knowing how to identify them is essential if you want to protect your edible greens.
Common Weeds That Look Like Arugula (and How to Identify Them)
Let’s go over the most common arugula look-alikes and the key traits that set them apart.
Wild Radish (Raphanus raphanistrum)
Wild radish has deeply lobed leaves like arugula, but its leaf texture is rougher and hairier. It also produces purple, yellow, or white flowers with veins, unlike arugula’s simple white petals.
How to tell the difference:
- Wild radish smells more earthy than peppery.
- Its leaves are stiffer and covered in small hairs.
- Flowers appear earlier in spring than arugula.
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Shepherd’s Purse (Capsella bursa-pastoris)
Shepherd’s purse grows low to the ground with small rosettes of lobed leaves, often mistaken for baby arugula. It gets its name from its heart-shaped seed pods that dangle below the flowers.
How to tell the difference:
- Leaves are smaller and more delicate than arugula’s.
- The plant has no strong scent when crushed.
- It sends up a tall, thin flowering stem as it matures.
Hairy Bittercress (Cardamine hirsuta)
Hairy bittercress often pops up in garden beds or pots where arugula might grow. Its leaves form in small clusters, and it sends up tiny white flowers on thin stems.
How to tell the difference:
- Has a slightly bitter, weedy flavor, not peppery.
- Stems are thin, wiry, and fragile.
- Often grows in cool, moist soil early in the season.
Wild Mustard (Sinapis arvensis)
Wild mustard looks the most like arugula when young similar leaves and growth pattern, but matures very differently. It produces bright yellow flowers and grows much taller than arugula.
How to tell the difference:
- The leaves are thicker, with prominent central veins.
- When crushed, it smells mildly mustardy, not peppery.
- Flowers form in clusters with four yellow petals.
Wild Rocket (Diplotaxis tenuifolia)
Why it’s confusing:
This one is actually a cousin of arugula, often sold as “wild arugula.” But gardeners sometimes mistake it for a weed.
How to tell the difference:
- Leaves: Narrower and more deeply lobed.
- Flavor: Stronger and more pungent than regular arugula.
- Growth: Perennial comes back each year if not controlled.
Control:
Trim regularly or contain it in pots to prevent spreading.
How to Tell Real Arugula from Look-Alike Weeds
If you’re unsure whether what’s growing is arugula or an impostor, here’s a quick identification checklist:
| Feature | Real Arugula | Look-Alike Weeds |
|---|---|---|
| Smell | Peppery, spicy | Mild or no smell |
| Leaf shape | Deeply lobed, jagged edges | Rounder, smoother, or hairy |
| Flower color | White or pale yellow | Bright yellow or purple |
| Taste | Peppery, nutty | Bitter or bland |
| Growth habit | Compact, bushy | Taller or weedy-looking |
💡 Pro tip: Crush a leaf and smell it. That distinct spicy scent means it’s real arugula.
When to Plant and Grow Real Arugula
If you’ve accidentally grown weeds instead of arugula, here’s how to grow the real thing properly.
When to Plant Arugula
- Cool-season crop: Best planted in early spring or fall.
- Sow as soon as the soil can be worked in spring or 6–8 weeks before the first frost in fall.
- Germinates in 5–10 days at 40–70°F (4–21°C).
How to Plant Arugula
- Loosen soil and mix in compost.
- Sow seeds ¼ inch deep and 1 inch apart.
- Keep rows about 6 inches apart.
- Water gently and keep the soil moist until seedlings appear.
Grow Arugula
- Light: Full sun to partial shade.
- Soil: Loose, fertile, and well-draining.
- Water: Keep consistently moist but not soggy.
- Fertilizer: Use a mild, balanced fertilizer or compost tea.
Harvest Arugula
- Harvest leaves when they’re 2–3 inches long for the best flavor.
- Cut outer leaves first and let the inner ones keep growing.
- For baby arugula, harvest 20–25 days after planting.
How to Prevent Weed Confusion Next Time
- Label your garden rows. It’s easy to forget where you planted arugula seeds.
- Use mulch to suppress weed growth.
- Weed early while plants are small.
- Grow in raised beds or containers for better control.
- Observe the scent and shape of young leaves before harvesting.
💡 Pro tip: Keep a small notebook or take pictures of seedlings each week for easy comparison.
F.A.Q
1. Are weeds that look like arugula edible?
Some, like lamb’s quarters and shepherd’s purse, are edible but always identify carefully before eating.
2. What’s the easiest way to tell arugula apart from weeds?
Crush a leaf and smell it. True arugula smells spicy and peppery.
3. Can I grow arugula in pots to avoid weeds?
Yes! Container gardening prevents most weed problems and gives you more control over soil and moisture.
4. How long does arugula take to mature?
Baby leaves are ready in 3 weeks, full-size leaves in about 40 days.
5. Do arugula and wild mustard cross-pollinate?
They can, but it’s rare. Still, it’s best to keep them separate if you save seeds.
Conclusion
If you’ve found weeds that look like arugula, don’t worry, it happens to even experienced gardeners. With a bit of observation and the right planting habits, you’ll be able to tell the difference easily.
Generally, make sure you do these things correctly:
- Learn to identify real arugula’s scent and shape.
- Weed early and often.
- Use labels and mulch for clarity.
- Grow in controlled spaces for cleaner crops.
If you can’t figure it out, ask someone for help or take a few pictures to compare online. Once you recognize true arugula’s distinct look and peppery scent, you’ll never mistake it for a weed again.
