Many homeowners seek tall plants for their flower bed borders. They can provide shade for less tolerant species of plants and prevent flowerbed soil erosion. In many cases, gardeners look for plants that grow to a specific height, have aesthetically pleasing qualities and are sufficiently hardy for their planting zone. Due to the more utility nature of tall border plants, it is important for them to be low maintenance.
Bleeding heart, or Dicentra, grows to be 24 to 36 inches tall and provides a fairly large cover area. It pleasing to the eye when in bloom. Pink flower petals hang beneath the stem. The bush does well in partial shade and is best for flower beds that are located in a cool area of the yards. The plant will grow well in most USDA Hardiness Zones but will wither and die in areas that have hot, direct sunlight.
Blue Anise Sage
Blue anise sage, or Salvia, is an aromatic, colourful flower that grows to great heights. Some species reach 6 feet. Blue anise sage is a useful backdrop plant for beds that are located in full to partial sun. These plants will provide a great deal of shade to the flowerbed's lower levels. Due to the flower's strong fragrance, it attracts many varieties of birds and butterflies. Gardeners can enjoy the blooms of this plant throughout the spring, summer and fall. Blue anise is used as a border plant in many gardens across the country because of its hardy nature.
Siberian Squill Alba
Siberian squill alba is a shorter border plant, but it can grow in thick clusters that protect more fragile species from wind and other elements. Siberian squill grows to only be about 6 inches tall. Squill will grow in full sun and partial shade and provides a very early spring and late winter coverage. Squill will begin growing well before most perennials and offer a nice border to flower beds in the early part of the growing season. Siberian squill is best grown in the more northern USDA Hardiness Zones due to its love of cooler weathers. Squill blooms are white and have a nice density that compliments most flowerbed arrangements.