Buddleja fallowiana
Buddleja fallowiana · Scrophulariaceae
📷 Ptelea · CC BY-SA 3.0
The gardener's calendar
Buddleja fallowiana is in full bloom: enjoy it, watch watering in hot weather and let spent flowers feed pollinators before pruning.
ID card
- Common name
- Fallow Butterfly Bush
- Family
- Scrophulariaceae
- Plant type
- Deciduous shrub
- Adult height
- Up to 3 m
- Flowering period
- July to September
- Flower color
- Pale yellow to cream
- Exposure
- Full sun
- Hardiness
- Moderate, zones 9-11
✓ Taxonomy verifiedSource: AI estimate · hardiness: reliability medium.
Expert tips
The key tip
Buddleja fallowiana loves sunshine and well-drained, poor soil. Hard prune in late winter (to 60 cm from ground) to remove deadwood and force beautiful summer flowering.
The common mistake
Failing to prune or pruning too late: the plant becomes woody, congested, and flowers poorly high up, leaving bare stems at the base.
The pro's trick
Wait until February-March when buds start swelling to prune.
Care
Exposure
Install this shrub in full sun for generous and lasting blooms. It also tolerates partial shade, but flowers will be less abundant. Avoid dense shade which would slow its growth and reduce flower production.
Watering
Fallow Butterfly Bush is not water-hungry once established. Water regularly in the first few weeks after planting to promote rooting. After that, you can space out waterings; reduce watering if there's regular rainfall to avoid overwatering.
Soil
This plant adapts to most well-drained soils. It prefers poor to moderately fertile ground. Lightly enrich the soil with organic matter at planting, but avoid excessive fertilizer applications which would promote foliage at the expense of flowers.
Pruning
Prune the Fallow Butterfly Bush in late winter (February-March) to remove dead branches and shape the silhouette. Deadhead spent flowers regularly during blooming to extend flower production. Annual light pruning is enough to maintain a balanced, well-branched form.
Fertilizer
A moderate fertilizer application in spring is sufficient to support growth. Prefer a balanced or nitrogen-light fertilizer to encourage flowering rather than foliage. Avoid overfeeding which would make the plant too lush and less floriferous.
Diseases and pests
Fallow Butterfly Bush is generally robust and rarely affected by diseases. Watch for powdery mildew in warm, humid conditions: promote good air circulation. Pests are rare; simply clean the foliage if dust accumulates.
Did you know?
Buddleja takes its name from British botanist Adam Buddle (1662-1715), a plant enthusiast. Native to mountainous regions of Yunnan in China, this particular species, fallowiana, was named in honor of British botanist Reginald Farrer or the Fallow locality. It's an aromatic little-known to French enthusiasts but highly prized for its delicate pale yellow-cream flowers.
Where to buy it
Best planted in autumn so the roots settle in before summer, or in early spring once the frost has passed. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, October, November.
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Tips generated and checked by Viridia — adapt them to your local climate.