Yellow orchid vine is a deceptively tough vine that sports charming clusters of orchid-shaped flowers and butterfly-shaped seed pods. Here’s how to plant and care for this Sonoran Desert native.
Yellow orchid vine (Callaeum macropterum) is a fast-growing evergreen vine native to Arizona and Mexico. Spring through fall it’s covered with butter-yellow, orchid-like flowers with ruffled petals.
It’s also called yellow butterfly vine, not because it attracts butterflies (which it does) but because its flowers are followed by papery seed pods shaped like butterflies. Pods start out lime green, becoming reddish-brown as they mature.
For a vine this pretty and delicate-looking, it’s surprisingly tough. It thrives in the hottest, sunniest spot in desert gardens. Plants are so tough that they are grown in downtown Tucson in commercial settings.
Why I Like This Plant
- Dainty orchid-like flowers
- Tough desert native
- Grows fast
- No thorns, not toxic, no pests
- Attracts bees, butterflies
Optimal Growing Conditions
If you’re thinking of adding a yellow orchid vine to your garden, you need to find a suitable place that will keep it healthy and looking good… while minimizing maintenance for you.
Here are the key factors to keep in mind.
Temperature
Grow yellow orchid vine in USDA Hardiness Zones 9 to 11. It’s a heat-loving vine that happily takes on the hottest spot in your garden, even in places like Phoenix.
It may suffer cosmetic damage when temperatures drop to the mid-twenties, but it is root-hardy into the teens and rebounds quickly in the spring.
Sun Exposure
Yellow orchid vine performs best when grown in full sun. It doesn’t mind the reflected heat off of a sun-drenched garden wall or building but will also tolerate some light shade.
Size and Growth Rate
Yellow orchid vine can be a little slow while it’s getting established, but then it ramps up to become a fast grower that usually reaches a size of 15 to 20 feet tall and wide. But it can grow taller depending on how it’s watered and pruned, and whether it dies back in the winter.
Soil
Yellow orchid vine grows well in most desert soil, from sandy to loam, provided it’s well-draining. However, don’t plant it in heavy clay soil unless it’s been amended.
Other Location Considerations
It has no thorns, is non-toxic, and is relatively low-litter, making it a user-friendly vine that you can plant in areas frequented by people and pets.
This twining vine readily grows up any nearby support structure, such as a trellis, lattice, or fence, to form a dense screen. It’s beautiful when rambling over the top of a ramada or pergola. When unsupported, plants will grow as a sprawling ground cover.
Yellow Orchid Vine:
The Essentials
| Common Name | Yellow orchid vine |
| Scientific Name | Callaeum macropterum |
| Origin | Arizona, Mexico |
| Plant Type | Evergreen vine |
| USDA Zones | Zones 9 – 11 |
| Cold Hardiness | To 20℉ |
| Flower Color | Yellow |
| Flower Season | Spring, summer, fall |
| Mature Size | 15′ high x 15′ wide |
| Growth Rate | Slow then fast |
| Sun Tolerance | Full, part, reflected sun |
| Water Needs | Low to moderate |
| Pests & Diseases | None |
| Garden Friendly | No thorns, non-toxic, low litter |
| Wildlife | Attracts butterflies, bees |
How to Plant
The rule of thumb when planting any vine in the desert is to dig a hole three times as wide as the root ball but no deeper.
Amending the soil when planting yellow orchid vine is not necessary unless you are planting in heavy clay soil. Then you should consider amending your hole with compost. You can also add sand or small gravel if your soil is poor-draining. Top with organic mulch rather than gravel, which helps to retain moisture and increase soil fertility.
When to Plant
The best time to plant yellow orchid vine is in the fall. This gives it three seasons to grow roots and get established before the following summer.
The second best time is in spring, the earlier the better. This still gives it time to get established before the intense heat of June arrives.
How to Care for Yellow Orchid Vine
Whether you’ve recently planted a yellow orchid vine or have an existing one in your yard, here’s how to take care of it to keep it healthy and looking its best.
How to Water New Vines
Once you’ve got your yellow orchid vine in the ground, watering is your most immediate concern. Here’s a recommended watering schedule for new vines planted in the spring or fall.
| Weeks 1 & 2 | Every 3 – 4 days |
| Weeks 3 & 4 | Every 6 – 7 days |
| Weeks 5 & 6 | Every 7 – 10 days |
| Weeks 7 & 8 | Every 10 – 14 days |
After week 8, gradually revise your watering schedule, depending on the season.
How to Water Established Plants
Here’s a recommended watering schedule for subsequent years.
| Spring & Fall | Every 10 – 14 days |
| Summer | Every 7 – 10 days |
| Winter | Every 14 – 21 days |
While plants can survive on less water, they look their best when watered once or twice a week during the summer.
Should You Fertilize?
The Arizona-Sonora Desert Museum recommends giving them one or two applications of fertilizer during the growing season.
How to Prune
Prune your yellow orchid vine in late winter or early spring to reinvigorate it and remove any cold damage.
You can prune lightly or extensively as needed to control its size. Prune basal sprouts to the ground if you wish to prevent their spread.
Plant Lover Facts
Yellow orchid vine (Callaeum macropterum) also goes by the common names yellow butterfly vine and butterfly pea vine. It’s not unusual to see it called by its former scientific name, Mascagnia macroptera.
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Author Bio
Deane Alban is the creator of Southwest Gardener. She is a science writer with a bachelor’s degree in botany from the University of South Florida. Gardening is her lifelong passion. She’s been gardening in Tucson for over 15 years.
Photo Credits
Mountain States Wholesale Nursery
Clinton & Charles Robertson, CC BY-SA 2.0, via Wikimedia Commons