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PlantFiles: Honeysuckle, Late Dutch Honeysuckle, Woodbine
Lonicera periclymenum 'Graham Thomas'

Family: Caprifoliaceae (cap-ree-foh-lee-AY-see-ee) (Info) (cap-ree-foh-lee-AY-see-ee) (Info)
Genus: Lonicera (luh-NIS-er-a) (Info)
Species: periclymenum (per-ee-KLY-men-um) (Info)
Cultivar: Graham Thomas
Additional cultivar information: (aka G.S. Thomas)

One vendor has this plant for sale.

7 members have or want this plant for trade.

Vines and Climbers

15-20 ft. (4.7-6 m)

20-30 ft. (6-9 m)

USDA Zone 5a: to -28.8 C (-20 F)
USDA Zone 5b: to -26.1 C (-15 F)
USDA Zone 6a: to -23.3 C (-10 F)
USDA Zone 6b: to -20.5 C (-5 F)
USDA Zone 7a: to -17.7 C (0 F)
USDA Zone 7b: to -14.9 C (5 F)
USDA Zone 8a: to -12.2 C (10 F)
USDA Zone 8b: to -9.4 C (15 F)
USDA Zone 9a: to -6.6 C (20 F)
USDA Zone 9b: to -3.8 C (25 F)

Sun Exposure:
Sun to Partial Shade

Parts of plant are poisonous if ingested

Bloom Color:
Bright Yellow
White/Near White

Bloom Time:
Mid Summer
Late Summer/Early Fall


Other details:
Average Water Needs; Water regularly; do not overwater

Soil pH requirements:
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)
7.6 to 7.8 (mildly alkaline)

Patent Information:
Unknown - Tell us

Propagation Methods:
From softwood cuttings
From semi-hardwood cuttings
From hardwood cuttings
By simple layering

Seed Collecting:
Allow seedheads to dry on plants; remove and collect seeds

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2 positives
2 neutrals
No negatives

Gardeners' Notes:

Positive coriaceous On Apr 2, 2014, coriaceous from ROSLINDALE, MA wrote:

'Graham Thomas' differs from the species only in the clear yellow flowers lacking a purplish tint.

In the Eastern US, where Japanese honeysuckle (Lonicera japonica) is prohibitively invasive, L. periclymenum is the best twining honeysuckle for fragrance. The fragrance is sweet and not heavy, strongest in the evening.

This species isn't aggressive in the garden, nor does it invade natural areas here (Boston Z6a).

Flowers occur in clusters at the ends of stems. To prolong bloom, I try to deadhead each cluster as it fades, before the fruit develops. When I do this, it goes through several flushes of bloom over the season. Otherwise, fruiting will bring blooming to a halt. The fruit is scarlet and highly ornamental, and I stop deadheading in September to allow a final crop to develop.

Bloom is best in full sun, but flowering can be good in light/dappled shade as well. In full sun the foliage is also less prone to powdery mildew.

Because it twines around its support, this plant shouldn't be allowed to climb into shrubs and trees, as it can strangle whatever its stem wraps itself around. It's better to plant it where it can climb on a fence or trellis or invisible netting.

Flowering occurs on new wood. Best pruned in early spring to remove dead wood as necessary.

Dirr says this is hardy Z4-8.

Positive RosinaBloom On Nov 15, 2013, RosinaBloom from Waihi
New Zealand (Zone 1) wrote:

Honeysuckle 'Graham Thomas' - RHS Award of Garden Merit

Neutral Hudson3 On Jun 10, 2011, Hudson3 from Hudson, NY wrote:

Not to be confused with L. 'Belgica', 'Serotina' (or other cultivars) . According to Michael Dirr (and others) "Graham Thomas is soft yellow without traces of purple."

Neutral TBGDN On Feb 10, 2006, TBGDN from (Zone 5a) wrote:

This is a very nice plant, but my experience is that too many vendors would just as soon sell you the Brooklyn Bridge if they could get away with it. I give up trying to find a reputable vendor for this since I have gotten anything but the true plant and wasted $$$!


This plant has been said to grow in the following regions:

Englewood, Colorado
Palmetto, Georgia
Roslindale, Massachusetts
Fort Jennings, Ohio
Souderton, Pennsylvania

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