wagnerianus is a cold hardy palm with fronds that are much more rigid,
smaller, and less deeply divided than the more common Trachycarpus fortunei (Windmill Palm).
Because of this, they are more resistant to wind damage and can easily handle
snow load. The foliage is a darker green than T. fortunei, and the trunk has
thicker fibre which hides the cut off leaf bases to make for a tidier
appearance. These characteristics have made it one of the most sought
after palms around the globe.
The cold hardiness of Trachycarpus wagnerianus is similar to Trachycarpus fortunei: -12°C to -17°C (10°F to 1°F). The parent palms for these seeds have endured prolonged severe cold without damage when Trachycarpus fortunei had frond damage a few blocks away. Once a Trachycarpus wagnerianus gets established it grows quite quickly.
I have had reports from Phoenix Arizona that Waggies from my seed breezed through 100F+ heat without damage on several occations.
Hybrid Trachycarus (wagnerianus x fortunei and fortunei x wagnerianus) are similarly hardy to pure Trachycarpus wagnerianus.
Trachycarpus wagnerianus x fortunei nainital (female is Trachycarpus wagnerianus). For this mix we use male pollen from a Trachycarpus fortunei nanital. This variant of fortunei is larger than regular fortunei. Combined with the wagnerianus female it makes for a very sturdy large deep green palm.
Trachycarpus fortunei x wagnerianus (female is Trachycarpus fortunei). For this mix I chose a particular female Trachycarpus fortunei that has large, very stiff fronds. It is seldom bothered by wind or snow. Combined with the wagnerianus male it makes for a palm with strong larger fronds than pure Trachycarpus wagnerianus.
Trachycarpus mystery palm x wagnerianus (female is Trachycarpus of an unknown species). The female palm I grew from seed. The seed batch was Trachycarpus latisectus, but this palm was something else. It is as hardy as Trachycarpus wagnerianus, but it's unique feature is circular fronds on every petiole, with many actually overlapping at the petiole. A picture of a frond can be seen to the right. It has been pollinated with Trachycarpus wagnerianus to produce seeds.