There are several different types of hazards that can stem from plants. Over time, these hazards have come to be uniformly classified and identified for easier communication between witches and wizards of different backgrounds and ability levels. This class system is known as the Wizarding Herbs with Irritating or Perilous Specialties, or W.H.I.P.S.

CLASS A: ODOROUS
At their core, plants in the odorous class can affect people, animals, or even other plants by releasing odors in the form of a powder or gas. When working with these plants one should wear a mask, use a Bubble-Head Charm, or take other similar precautions.

Level One
Level one is the most severe and indicates a plant that puts you in immediate danger of death.
-Hagweed
- Mandrake
Level Two
Plants from this subclass are slightly less dangerous, but can still cause death over a long period of exposure, or over repeated encounters if not treated each time.This danger is in the form of poison and other elements whether inhaled as a gas or powder.
-Smogwood Tree
Level Three
There are three separate possible issues a level three odorous plant may present.
+PARALYSIS -- persons will lose the ability to protect themselves once affected by the plant.
- spider flower- pollen causes paralysis
+DISORIENTATION-- can still lead to potentially disastrous or deadly mistakes.
+DEEP SLEEP --- potentially leaving them open to danger.

CLASS B: PHYSICALLY AGGRESSIVE
This class includes plants which may intentionally cause damage when feeling threatened or to obtain food.

The ability to strangle is usually found in magical vine-like plants and can either be used as a self defence mechanism, or for capturing and consuming prey.
- Devil's Snare- they prefer the damp and dark and are usually only found in cave systems or shadowy bogs. Introduce some light into its environment, as it will shrivel.

Plants with teeth may bite.
-Fanged Geranium -- whose bite will inflict a nasty poison that causes human skin to swell, bubble, and in some extreme cases, turn reddish with white spots.

There are also many plants with sharp leaves that can cut through your clothing and skin. They can be sharp enough to cut into arteries.
-Spiky Bush--which will shoot its own sharp projectiles towards you to cut you.

CLASS C TOXIC
This class deals with plants that are toxic to humans.
Plants under the toxic umbrella are further classified via a four level system based on the amount required to reach a lethal dose. Plants with a rating of four are so poisonous that contact with your bare skin may be cause for alarm, whereas plenty of plants that have rated at level one are still frequently used in potions or consumed raw.
There are two general types of toxic plant.
First, there are poisonous plants that either contain or are covered in toxic chemicals released by touching or consuming a part of the plant.
- Venomous Tentacula
The second type, venomous plants, inject toxins directly through needles, fangs, hairs.
- Belladona

CLASS D: INFECTIOUS
Infectious plants come in two subclasses: naturally infectious and diseased.
Naturally infectious plants are able to spread viruses and other conditions even when in peak health.
- Coughagus Ivy, which will give you all the symptoms of a cold if you wander near it.
Diseased plants, on the other hand, have contracted an illness, and are now prone to spreading it.
-There is no specific plant that falls under this class as it is conditional.

CLASS E: BURNING
Burning plants are a wild bunch! These plants cause slow-to-rapid destruction of skin, fur, or any other material they touch.
Some plants have strong acids or bases in them, which they will release when disturbed. This can then cause very serious burns.
Fire plants are the same, as when it comes down to it, a chemical burn and a regular burn cause similar damage.
-Fire Seed Bushes--their seeds cannot even be held with dragonhide gloves.
Freezing plants have stinging hairs which will cause a sensation similar to nettles, they will slowly freeze your skin.
-Arctic Aloe -- freezing plants can activate nerve impulses that will decrease your body temperature, causing your heart rate to slow down.

CLASS F: REACTIVE
Just what counts as an undesirable stimulus varies from one plant to another, but in general, it refers to a material that causes a reaction -- in this case, usually an explosion, though acrid and poisonous puffs of smoke are also possible.
-Gunpowder Gloriosas -- known to combust (and frequently explode) whenever exposed to sunlight for more than exactly three hours a day.