Peppermint was first discovered growing in an English field of spearmint in the seventeenth century. This natural hybrid was then cultivated for the fragrant oil found in its leaves and flowering tops. Holland & Barrett provide this popular botanical extract in liquid form for those individuals who find it difficult to swallow capsules or tablets. Peppermint was first discovered growing in an English field of spearmint in the seventeenth century. This natural hybrid was then cultivated for the fragrant oil found in its leaves and flowering tops. Holland & Barrett provide this popular botanical extract in liquid form for those individuals who find it difficult to swallow capsules or tablets.