Using a non-magical plant is not enough to make the herb magical in a potion. For a plant to be magical, it must display strange habits or special skills. Non-magical plants can be used by Muggles to heal wounds & illnesses; this is why some are skeptical of herbology. Muggles use the plants basic effects, whereas witches & wizards use the plants for potions which then mixes with magic & reacts magically. The only thing that magical plants possess is Sentience. Non-magical plants are not Sentient; they normally don't explode or cause heat changes when potioneering.

Roses

Roses are non-magical & are essentially shrubs. Roses have many colors, scents, & magical attributes. There are forty uses of this plant. Potions with roses help with coughing, wheezing, colds, fevers, & flus. Roses can help control constipation, diarrhea, kidney functions, stomach functions, & menstrual issues.

Fun Facts
⊱ People who believe in the Sentience theory, think that the plants sensory is from roots or hairs.
⊱ Salt, armadillos, horses, & crocodiles are items that are usually in a potion.
⊱ These special skills can be the plant, such as Creeping Ivy's skill to move freely, or to a person who uses the plant such as Gillyweed.
⊱ Roses were discovered in the first century by Pliny the Elder; a philosopher who invented thirty-two medical purposes.