How to Grow Butterfly Bush

Butterfly bush thrives in full sun, at least 8 hours per day. It can tolerate part sun, but it may not bloom as prolifically and may not attract as many butterflies as it would in a warm location. It grows in many soil types if well-drained. It will not be happy in wet areas in the landscape, which will likely result in root rot. Avoid low, boggy areas and do not locate where a sprinkler keeps the ground saturated. The pH level is best around 6.0 to 7.0. In colder climates, it may die back to the ground when temperatures dip but typically resprouts in the spring. 

The Pugster series is available in several color options such as blue, periwinkle, pink, and white. They are compact plants, growing to only about 2 feet tall and 2 to 3 feet wide. Even though they are compact, the blooms are quite large. The plant has strong, thick stems, which is noted as a favorable characteristic to withstand cold conditions in zone 5. 

Lo & Behold ‘Blue Chip’ was one of the earliest dwarf butterfly bushes and now Lo & Behold ‘Blue Chip Jr.’ is quite popular. It blooms before other buddleias and goes strong through the summer. The Lo & Behold series also presents many color choices. The Flutterby Petite Series is another choice. Dwarf varieties have many uses, from border and edging plants, to containers, to planting in masses for a striking display in the landscape, or even as a groundcover. They may be small, but they will reward with big blooms. No deadheading is needed to keep them looking their best and producing fragrant, colorful blooms that will make you smile every time you view them.

Before planting, decide whether you want to grow butterfly bush as a specimen plant in the landscape or whether to include it in a mixed shrub border or butterfly garden. It is beautiful as a backdrop to perennial gardens. Consider your space. Butterfly bush can grow quite large. A popular cultivar, ‘Black Knight’, grows 6 to 8 feet tall and 4 to 6 feet wide. Fortunately, dwarf and semi-dwarf varieties are available and are more suitable for smaller spaces.

The best time to plant is the spring, which gives it time to get established before cold weather. Plant butterfly bush high, particularly in heavy soils like clay. Unlike many other plants, the base must sit a bit higher than the ground. This helps facilitate good drainage, which is essential. There is no need to amend the soil. Rather, plant directly into the natural soil.

When planting a compact variety in a container, make sure the container has large drainage holes. Use a well-drained potting mix. Avoid mulching around the plant. This plant likes dry conditions and may not be happy with the amount of moisture that mulch can hold. In colder climates, some protection from winter winds and cold, damp conditions is important. Iowa State Extension recommends mounding a few inches of soil around the base of each plant to help protect the crowns. 

Fertilizing

Butterfly bushes are light feeders and do not need a lot of fertilizer. Fertilize in the spring with fertilizer for flowering shrubs. Follow label directions.

Controlling Pests, Diseases, and Other Problems

This plant typically does not have a lot of diseases or insect problems. During hot, dry spells, spider mites might be a problem. They usually are found on the undersides of the leaves. If needed, spray a stream of water to dislodge them but do not use chemicals that will harm beneficial insects that visit the plant. It is best to spray with water early in the day to allow the plant to dry before nightfall to help prevent any fungal diseases.

• Butterfly bush blooms on new growth. Blooming is usually enhanced by pruning the plant to within one foot of the ground in the spring. Avoid pruning during the fall or winter which can increase the chances of cold damage.
• Butterfly bush shows beautiful foliage and blooms, is heat tolerant, attracts pollinators to the garden, and is resistant to deer. 
• Numerous varieties are available. Consider your space and check the plant tag for information on size. The plant grows to full size quickly. 
• Butterfly bush sometimes elicits conversations, with contrasting views on whether this is a worthwhile plant in the garden. The plant, which originates in Asia, is favored for its colorful blooms and foliage and its ability to attract butterflies. On the other hand, in some regions, it is considered invasive, which means it may crowd out native vegetation. If this is a plant that you are interested in adding to your landscape, it is worth checking the invasive list for your state and whether there are any sterile cultivars that are acceptable for your area. Other than that, unless you grow only native plants in your garden, butterfly bush is a great plant to consider. Plant it in a sunny location with a sitting area nearby so you can enjoy the butterfly activity on a bright afternoon.