This is a lovely reference book particularly if you have a bit of a garden and are growing your own plants.
Gerard was an Elizabethan herbalist and gives a description of each plant described, along with notes on when and where they grow and flower, various names and best of all their virtues which details how they can be used.
Because Gerard wrote his book in the late 16th century it includes not only old favourites among plants like foxglove, cucumber (or cowcumber) and oats but also new and exciting plant like Tulips and the potato.
Although taking your medical advice from 16th century herbals probably is not the best idea , "The herb chewed and held in the mouth, bringeth mightily from the braine slimie flegme like Pellitorie of Spain" is closer to my idea of an ideal outcome when suffering from a cold rather than the meek promise of decongestion promised by modern over the counter medicines.
The description of violets is particularly fine: "...yea gardens themselves receive by these the greatest ornament of all, chiefest beauty, and most excellent grace, and the recreation of the minde which is taken hereby cannot be but very good and honest; for they admonish and stirre up a man to that which is comely and honest; for floures through their beauty, variety of colour, and exquisit forme, do bring to a liberall and gentle manly minde, the remembrance of honestie, comlinesse, and all kindes of vertues: for it would be an unseemly and filthy thing (as a wise man saith) for him that doth looke upon and handle faire and beautiful things, to have his mind not faire, but filthy and deformed."