Dragon’s Blood Plant: Herb Robert Benefits, Uses, Identification, and Safety

2.1K

The dragon’s blood plant is often used as a common name for Herb Robert, a strongly scented wild geranium known botanically as Geranium robertianum. It has a long history in folk herbalism, especially for minor skin irritation, mouth rinses, and digestive complaints. That history is interesting, but it should not be confused with proof that the plant treats disease.

There is another source of confusion: dragon’s blood also refers to a red plant resin sold in supplements, tinctures, incense, and skin products. That resin usually comes from very different plants. Herb Robert, dragon’s blood resin, and dragon’s blood essential oil should not be treated as the same product.

What Is the Dragon’s Blood Plant?

Herb Robert is a low-growing plant in the geranium family. It is also called stinky Bob, red robin, storksbill, and wild crane’s-bill. It often grows in shaded, damp places, including woodlands, walls, rocky slopes, and disturbed garden edges.

The plant is easy to overlook until it flowers. Its leaves are lacy and divided, its stems often turn reddish, and the plant gives off a strong odor when crushed. Small five-petaled pink flowers appear during the growing season. In some regions, Herb Robert is considered invasive or a noxious weed because it can spread quickly and crowd out native plants [King County, n.d.].

Dragon’s Blood Plant vs. Dragon’s Blood Resin

This distinction matters for safety and accuracy.

The Herb Robert plant discussed here is Geranium robertianum. Traditional herbal preparations use the aerial parts of the plant, usually as tea, infusion, wash, or compress.

Dragon’s blood resin is different. It is a red resin or exudate produced by certain plants in genera such as Dracaena, Daemonorops, Croton, and Pterocarpus [Jura-Morawiec & Tulik, 2016]. Products labeled dragon’s blood may not contain Herb Robert at all.

Because names vary across herbal traditions and product labels, check the botanical name before using any plant or supplement. A common name alone is not enough.

Traditional Uses of Herb Robert

Herb Robert has been used traditionally as an astringent herb. Astringent herbs contain compounds, often tannins, that can tighten tissues and dry minor secretions. This explains why older herbal texts commonly mention Herb Robert for minor diarrhea, mouth rinses, irritated gums, small skin eruptions, and external washes.

Traditional uses do not prove clinical effectiveness. For Herb Robert, most modern evidence comes from chemical analysis, lab studies, and early biological research rather than large human trials.

What the Evidence Actually Shows

Tannins and astringent action

Research has found that Geranium robertianum contains several plant compounds, including tannins, flavonoids, phenolic acids, and essential oil components [Haj Ali et al., 2025]. One study of Herb Robert decoctions found that the stems and leaves were especially rich in tannins and showed antioxidant activity in lab testing [Catarino et al., 2017].

This supports the traditional idea that Herb Robert has astringent properties. It does not mean the plant should be used as a treatment for serious infections, eye disease, diabetes, shingles, or eczema flares.

Skin and wound-related research

Several lab studies suggest that extracts of Geranium robertianum may have antibacterial activity. A 2023 study reported antimicrobial activity against selected bacteria and fungi, and the authors noted that this may help explain the plant’s traditional use for hard-to-heal wounds [Swiątek et al., 2023]. A 2024 study also found antibacterial effects from optimized extracts in laboratory testing [Stanković et al., 2024].

These findings are promising but early. Lab antibacterial activity does not prove that a homemade tea, wash, or compress will safely treat a wound. Open wounds, spreading redness, pus, fever, worsening pain, or red streaks from the wound need medical care.

Blood sugar and internal-use claims

Older herbal sources sometimes describe Herb Robert as mildly blood-sugar-lowering. Modern reviews discuss possible antidiabetic activity, but the evidence remains limited and is not strong enough to recommend Herb Robert for diabetes management [Haj Ali et al., 2025].

Do not use Herb Robert to replace diabetes medication, glucose monitoring, or a prescribed eating plan. If blood sugar control is a concern, focus on proven nutrition strategies, medication adherence, and care from a qualified clinician. For food-based guidance, see this related guide to a diabetic-friendly diet.

How to Identify Herb Robert Safely

Herb Robert is usually identified by a combination of features:

• Low-growing habit, often spreading or loosely upright
• Lacy leaves with three to five main lobes
• Reddish, hairy stems
• Small pink flowers with five petals
• Strong, unpleasant odor when crushed
• Long, beak-like seed capsules typical of many geraniums

Never rely on smell alone. Many unrelated plants have unpleasant odors, and some dangerous plants may be misidentified by casual foragers.

A plant-identification app can be a helpful starting point, but it is not enough for medicinal use. If you plan to harvest a wild plant, confirm it with a trained botanist, local extension service, experienced herbalist, or regional plant guide.

Poison Hemlock Warning

The most important safety point is simple: do not consume or apply any wild plant unless you are completely sure of its identity.

Poison hemlock (Conium maculatum) is highly toxic. It can be fatal if eaten, and every part of the plant is poisonous. Poison hemlock is usually taller than Herb Robert and has white umbrella-shaped flower clusters, hollow stems with purple blotches, and parsley-like leaves [Cleveland Clinic, 2022].

If you think you may have eaten poison hemlock, call emergency services or Poison Control immediately. Symptoms may include vomiting, sweating, excess salivation, confusion, tremors, seizures, muscle weakness, and breathing problems [Cleveland Clinic, 2022].

Herb Robert and poison hemlock are not close botanical relatives, but casual plant identification mistakes can be serious. Do not taste a plant to identify it.

How People Traditionally Use Herb Robert

Herb Robert has traditionally been prepared as:

• A mild tea or infusion
• A stronger decoction for external washing
• A compress for minor skin irritation
• A mouth rinse for minor gum or mouth irritation

Evidence-based dosing has not been established. The older dosing instructions found in some herbals are not the same as modern safety guidance. Because product strength, plant chemistry, harvest timing, and preparation methods vary, internal use should be discussed with a qualified healthcare professional or trained clinical herbalist.

Avoid putting homemade herbal preparations in the eyes. Eye irritation, discharge, pain, light sensitivity, or vision changes should be evaluated by an eye-care professional.

Safety, Side Effects, and Who Should Avoid It

Herb Robert is not well studied in pregnant people, breastfeeding people, children, or people with significant medical conditions. The National Center for Complementary and Integrative Health warns that many herbal supplements have limited safety testing, may interact with medications, and may differ from products used in research [NCCIH, n.d.].

Avoid internal use of Herb Robert unless a qualified professional says it is appropriate. This is especially important if you:

• Are pregnant or breastfeeding
• Are giving herbs to a child
• Take diabetes medication
• Take blood thinners or antiplatelet medication
• Have liver or kidney disease
• Are scheduled for surgery
• Have a history of allergic reactions to plants in the geranium family
• Have an infected wound, eye symptoms, or a serious skin condition

Possible side effects may include stomach upset, irritation from topical use, or allergic reaction. Because Herb Robert is rich in tannins, large or frequent internal doses may be irritating to the digestive tract.

When to Get Medical Help

Self-care is not enough if symptoms are severe, worsening, or unexplained.

Seek urgent care for:

• Suspected poison hemlock exposure
• Trouble breathing, confusion, seizures, or severe weakness
• Eye pain, vision changes, or thick eye discharge
• A wound with spreading redness, warmth, pus, fever, or red streaks
• Severe diarrhea, dehydration, bloody stool, or persistent abdominal pain
• Skin blisters, severe swelling, or rapidly spreading rash

For eczema, shingles, herpes, conjunctivitis, diabetes, or persistent mouth inflammation, Herb Robert should not be used as a stand-alone treatment. These conditions need proper diagnosis and care. For nutrition-based support during eczema flares, see this related guide to foods for eczema.

Health Disclaimer This article is for educational purposes only. It is not medical advice and should not replace diagnosis, treatment, or guidance from a qualified healthcare professional. Herbal products can cause side effects, interact with medications, and vary widely in strength and purity. Talk with a clinician before using Herb Robert internally, applying it to broken skin, using it around the eyes, or combining it with medication.

Frequently Asked Questions

References

1. Catarino, M. D., et al. Antioxidant and anti-inflammatory activities of Geranium robertianum L. decoctions. PubMed, 2017. View source
2. Cleveland Clinic. Poison Hemlock. 2022. View source
3. Haj Ali, D., et al. An Up-to-Date Review Regarding the Biological Activity of Geranium robertianum L. PubMed, 2025. View source
4. Jura-Morawiec, J., and Tulik, M. Dragon’s blood secretion and its ecological significance. Chemoecology, 2016. View source
5. King County Noxious Weed Control Board. Herb Robert identification and control. View source
6. National Center for Complementary and Integrative Health. Dietary and Herbal Supplements. View source
7. Swiątek, L., et al. Herb Robert’s Gift against Human Diseases: Anticancer and Antimicrobial Activity of Geranium robertianum L. PubMed, 2023. View source
8. Stanković, M. M., et al. A comprehensive study on Geranium robertianum L. antibacterial potential. PubMed, 2024. View source