03/09/2026
🌿 W**D OF THE DAY — DAY 16
⚠️ GIANT HOGW**D — Heracleum mantegazzianum
Now this one isn't one to mess with! 😂
Giant hogweed is a non-native invasive plant that can grow several metres tall and is commonly found around riverbanks, damp ground, wasteland and woodland edges. �
RHS +1
🔎 HOW TO SPOT IT
🌱 Huge size — mature plants can reach around 3–5 metres tall.
🌿 Massive, deeply divided leaves — some can grow over 2 metres long.
🟣 Stem — thick, often with purple/reddish blotches and coarse white hairs.
🌼 Flowers — enormous umbrella-shaped clusters of tiny white flowers, potentially 50–80cm across. �
Wigan Council +1
It can be confused with common hogweed and cow parsley, particularly when young, so identification needs care. �
RHS
🚨 WHY IS IT DANGEROUS?
The sap contains chemicals called furanocoumarins. If the sap gets onto your skin and that skin is exposed to sunlight, it can cause a severe reaction called phytophotodermatitis.
That can mean:
🔥 Painful burning
💥 Severe blistering
🟤 Long-lasting changes to skin colour
😬 Potential scarring
And importantly, you don't necessarily feel the effects immediately. �
RHS +1
🧤 WHAT IF YOU FIND IT?
DON'T TOUCH IT. Don't strim it. Don't pull it up with bare hands.
If it's on your property, the safest option is to have it dealt with by someone experienced in invasive-plant removal. Giant hogweed also needs to be disposed of properly — don't put it in your compost or normal garden waste. �
RHS +1
If you get sap on your skin:
➡️ Cover the area immediately and keep it away from sunlight.
➡️ Wash thoroughly with soap and cold water.
➡️ If you develop blistering, or sap gets into your eyes, seek medical advice. �
nidirect
🌿 DAY 16 VERDICT
This might look impressive, but unlike most of the weeds we've featured, this is one I'd definitely leave well alone. 😂
Have you ever come across Giant Hogweed? 🌿⚠️