Levisticum officinale. Sow some Lovage seeds for the tallest of the garden herbs. Lovage makes a striking accent in any garden, especially when it flowers. It is an umbelliferous plant in the family Apiaceae, which makes it a cousin of the carrot. But this herb is a massive perennial plant that grows 1.8âÂÂ2.5m (6âÂÂ8′) in…