Bicolor Butterfly Bush Buying Guide: What to Look For

A healthy bicolor butterfly bush gives you honey-scented spikes from early summer into September, with butterflies and bees working them all day. A stressed, root-bound or soggy one can sulk through its first season and flower late or barely at all.

Below, you'll find out all about buying a bicolor butterfly bush, including the container size we recommend, how to read the foliage and stems, what bloom color and hardiness zone mean for you, what fair prices look like, and the red flags worth walking away from.

We grow and ship these plants, so we know what a good one looks like when it comes out of the box. Here's how we'd pick one.

Which Bicolor Butterfly Bush to Buy

Our answer is a healthy one-gallon plant bought in spring, with several stems and roots that fill the pot without circling it. Here's why we point customers there and what each size really gets you.

One of the best features of bicolor butterfly bush is that even a small quart plant will produce flowers in its first year. Don't buy an older or more expensive plant if all you want is blooms this season. A younger plant often catches up in overall size within a year or two and costs a fraction as much.

The usual advice is to buy the biggest plant you can afford for instant impact. We don't follow it for this shrub. It grows fast enough that a younger plant is rarely behind for long, and smaller plants settle in with less transplant sulk.

That said, a #1 or #3 plant gives you a head start if you're building a large pollinator planting or want immediate presence. A healthy larger specimen will have woody stems and a wider silhouette, with many bloom sites firing at once.

Be honest with yourself about mature size. The species reaches 6 to 12 feet high and 4 to 15 feet wide, while a compact cultivar such as 'Attraction' stays 4 to 6 feet tall and wide. Unless the label names a compact cultivar, plan on the larger range and give it room. Our guide on how big a bicolor butterfly bush really gets goes deeper.

Container Sizes

You'll mostly see three sizes: quarts, #1 gallons and #3 gallons. Here is what each one holds.

The bicolor butterfly bush for sale in nurseries typically comes in one of three sizes. Quart containers (about 1 liter) hold young plants, usually 6 to 12 inches tall, that will often bloom the first year if given good care. These are budget-friendly and ship well if you're ordering online.

One-gallon (#1) containers hold plants roughly 12 to 18 inches tall with more established root systems. These will flower reliably and fill a space faster than quarts, which is why they're our usual recommendation. Given a spot with room, a #1 plant typically fills out in about two to three growing seasons.

Three-gallon (#3) containers hold plants 18 to 24 inches or taller, already approaching their second year of growth. These cost more upfront but deliver instant impact and mature faster. If you're in a hurry to fill a gap in a border or want a large container specimen, the #3 is worth the investment. For container growing, step up to a 15-gallon or larger pot to give the plant room without constant watering.

All butterfly bush container sizes should drain freely. Ask the nursery about their watering schedule and potting mix. If the soil is dense clay or always soggy, the plant's roots may already be struggling beneath the surface, even if the foliage looks good.

What to Expect on Arrival

A plant that has spent several days in a box needs a quick check the day it arrives.

Expect a little leaf droop, and a few yellow leaves at the very bottom. In our rows, we see that settle within a week once the plant is in light and watered. Mushy stems or a sour-smelling root ball are a different story, and you should contact the seller right away.

Reading the Plant: Foliage, Stems, and Vigor

A healthy bicolor butterfly bush will display several telltale signs whether it's 18 inches tall or nearly full-size. Start with the foliage: leaves should be a soft gray-green, with a slightly felted or silvery underside that's characteristic of the species. If the plant looks dull, spotted, or has yellowing leaves, move on. This could signal overwatering, poor drainage, or early disease.

Check the stems next. They should be firm and woody, not mushy or hollow. A light squeeze should feel solid. If your finger leaves an indent or the stem bends with no resistance, the plant has likely been overwatered. Inspect both sides of the leaves for webbing or tiny moving spots, because spider mites are common on butterfly bush. Ask the grower if they've treated for pests recently, and if they haven't checked the plant, you're buying a problem.

Vigor matters most. Look for compact, bushy growth rather than a single tall stem. A well-grown plant will have multiple branches, not one gangly shoot. This indicates proper pruning and care at the nursery. If a plant looks leggy and thin, it either wasn't pruned correctly or spent too long in low light.

Customers usually ask us whether a few yellow leaves are a dealbreaker. A few at the very bottom of a plant that's been boxed or moved are normal. Yellowing across the whole plant is the sign to worry about.

Bloom Color, Scent, and Your Hardiness Zone

Two things decide whether this shrub gives you the summer you're picturing: the tones of its flowers and whether it suits your winters.

Bloom Color and Scent

The flowers are why most people buy this plant, so it pays to know what you'll actually see. Our guide to bloom colors, timing and season has more.

The bicolor form produces two-tone flower spikes, usually pairing purple or lavender with a second, warmer tone. The exact combination varies by strain, since 'Bicolor Butterfly Bush' as sold is often a trade name rather than one fixed cultivar.

For comparison, the species is lilac with an orange throat, and compact 'Attraction' is purple/lavender and red/burgundy. If you have a color preference, ask the nursery about their strain or look for plants with buds already forming so you can see what you're getting. Strain also affects whether you can propagate your own cuttings from the plant.

Healthy buds should be plump and beginning to show color if the plant is mature enough. If buds are sparse or absent on a large plant, it may have been pruned too late, since flowers form on new growth and the usual advice is to prune in early spring. Once planted, it blooms from about June through September. On warm, still days the honey-like fragrance is the reward, and butterflies and bees work the spikes all day.

Hardiness Zone

Hardiness is the other half of the decision. The species is winter hardy in USDA zones 5 through 9, and what that means depends on which end of the range you live in. Our hardiness zone guide covers it in more detail.

Bicolor butterfly bush thrives in USDA zones 5 through 9. If you're in zone 5 or 6, the plant will die back to the ground each winter and regrow as a woody-based perennial. This is normal and not a failure. Buy with this knowledge: it's not a year-round landscape shrub in cold zones, but a vigorous seasonal performer that flowers reliably when spring arrives.

If you're in zones 7 through 9, the plant becomes a permanent woody shrub that keeps its structure year after year. This opens up possibilities for larger specimens and multi-year training. Regardless of zone, always select a plant grown in a zone no warmer than your own. A plant from zone 9 stock may be weaker in zone 6.

Prices and Where to Buy

Prices vary by region and by how a plant was grown, but the ranges below are what we'd call fair for each size. After that, we cover the buying routes and what each does well.

What Each Size Costs

Cost climbs with container size, but not always with value.

Quart containers typically run $15 to $35 depending on the region and nursery. These are excellent value if you're patient or starting a large planting. They establish reliably and prove that nursery-grown specimen quality matters more than initial size.

One-gallon plants usually cost $30 to $60. This is the sweet spot for most home gardeners: mature enough to establish quickly, affordable, and proven to perform. You get a year head start compared to quarts and won't overpay for specimen status.

Three-gallon and larger specimens can run $60 to $120 or more. These justify the price if you want visual impact immediately or live in a colder zone where the plant needs time to establish before winter dormancy. A best butterfly bush to buy at this size will already have a thick woody base and dense branch structure.

Mail-order plants may carry higher prices due to shipping costs and holding time in the nursery. Local nursery purchases often feel cheaper but factor in gas and time. Online retailers sometimes offer bundle discounts if you buy multiple sizes or companion plants like coneflower, black-eyed Susan, or lavender.

Where to Buy

We grow and ship plants ourselves, so we have a bias. Even so, every route has real strengths.

Local independent nurseries are your best bet for hands-on inspection. Staff can answer questions about their specific strain, care regimen, and hardiness. You'll also avoid shipping stress and can plant immediately if your soil is ready.

Regional big-box garden centers (Home Depot, Lowe's) carry butterfly bush in season, typically spring through early summer. Quality is variable, but these are convenient and often have return policies. Inspect plants carefully before purchasing, as turnover is high and plants may sit in suboptimal light or water conditions.

Specialty online nurseries ship container plants in spring, and some ship bare-root. Shipping takes longer, but selection is often wider and staff expertise is genuine. Read customer reviews for notes on how plants look when they arrive before you order.

Mail-order from large national growers works if you're buying multiple plants or accepting the slower-to-establish timeline of younger specimens. Calculate total cost with shipping, which can be substantial for a #3 or larger. Request they pack for spring arrival, not peak heat.

Red Flags and Plants to Skip

Some problems are fixable and some aren't. These are the ones we'd walk away from.

Avoid any plant with mushy stems, black leaf spots, or obvious pest infestations. These problems rarely resolve, so you're buying a project instead of a plant. Root rot in poorly drained soil is the leading cause, and once advanced, it's difficult to reverse.

Skip plants that are clearly root-bound, with roots circling the inside of the pot or protruding from drainage holes. While butterfly bush tolerates many conditions, a severely stressed root system takes months to recover and may not flower reliably that first season.

If a plant looks bone-dry and the soil has separated from the pot sides, the grower has been careless. A single dry cycle can kill young plants, and repeated neglect weakens even established ones. Check the soil moisture before you commit.

Be cautious of "invasive species warnings" if you're in the Pacific Northwest (Oregon, Washington) or UK. The parent species is regulated in these regions due to prolific self-seeding. Check local nursery and extension rules before buying. Deadheading and sterile or low-seed cultivars are preferred where regulated.

Don't confuse bicolor butterfly bush with other Buddleja species. Buddleja alternifolia (fountain butterfly bush) is a different plant altogether, with a weeping habit and earlier bloom time. Read the botanical label carefully.

Your First Week at Home

After you bring your bicolor butterfly bush home, you're not done. Before planting, harden it off if it's been inside a nursery greenhouse. Place it in dappled shade outdoors for 3 to 5 days so foliage acclimates to direct sun.

Then plant in a spot with at least 6 hours of full sun (blooms and habit decline noticeably in part shade) and well-drained soil. Space plants 4 to 6 feet apart. Water moderately the first few weeks, then allow the soil to dry between waterings as the plant establishes. For full growing details and seasonal care, see our complete growing guide.

Quick Reference: What to Evaluate Before Buying

Use this table as a pocket checklist when you're standing in front of the plants or unboxing an order.

Factor	What to Look For	Red Flag
Foliage	Gray-green, silvery underside, no spots	Yellowing, wilting, webbing, or pests
Stems	Firm, woody, multiple branches	Mushy, hollow, or single leggy shoot
Container Size	Quart, #1, or #3, drains freely	Waterlogged soil, root bound, no drainage
Growth Form	Bushy, compact, well-pruned	Gangly, overgrown, or severely pruned back
Zone Hardy	Grown in zone 5-9, preferably your zone or cooler	Zone 10+ stock in a zone 6 location
Buds and Flowers	Forming, showing two-tone purple and warmer-toned color	Sparse or absent on mature plants
Price Range	Quart $15-35, #1 $30-60, #3 $60-120	Unusually cheap or suspiciously overpriced

Bring Home a Bicolor That Blooms

Our short version is to buy a healthy one-gallon plant in spring, squeeze the stems, check the leaves for mites, and ask about the strain if color matters to you. Match the plant to your zone, skip anything root-bound or bone-dry, and don't pay extra for size when a younger plant will catch up.

As a small grower, we'd rather you walk away from the wrong plant than carry home a disappointing one, because every shrub we sell comes from our own farms and has to earn its place in your garden. We grow and sell top-quality shrubs, and we want your bicolor to be covered in butterflies by midsummer.