Home Out & About Excursions In search of heat, caviar and coffee – Swiss made
Last update on January 30, 2019

We explain where you can explore Swiss-made tropical products such as papaya, bananas and coffee – and steamy, fragrant heat.

Bananas and papayas, caviar and coffee – none of them typically Swiss products. But in one corner of Canton Bern you can find all of them, all homegrown. It’s a totally tropical side to Swiss life that many people have never seen – and all achieved thanks to a giant tunnel.

The Tropenhaus

Back in 1999 the excavations started for the deep Lötschberg Base Tunnel linking the cantons of Bern and Valais with a new high-speed line. One unexpected by-product of the tunnelling was an awful lot of warm water, which at 20oC was too hot to pump straight into the Kander River. At that temperature the spawning salmon would’ve died. So another solution was found.

Things to do in Switzerland

Cue the Tropenhaus in Frutigen. It uses the warm water (gushing through at 100L per second) to heat its tropical plant houses, where all manner of weird and wonderful fruit and flowers now grow. Not just 26 types of banana but also starfruit, guavas, lychees and mangoes, plus a whole array of orchids. It’s a fragrant – and steamy – place to spend some time.

A slice of tropical life in the Alps

Outside are the huge fish pools where the slightly cooler water (12 to 18oC) is a perfect place to breed Siberian sturgeon. Even in the depths of a Swiss winter, the fish are cosy and warm in their water world. And producing eggs, also known as caviar, which is on sale in the shop: CHF 315 for 50g! That makes the home-grown espresso at CHF 29 look like a bargain.

Things to do in Switzerland

There’s also a restaurant which features 101 ways to serve sturgeon. But the main reason to go is simply to see the plants that don’t really belong at 800m up in the Alps. It’s certainly cheaper than flying to the Caribbean.

Getting there

The Tropenhaus (closed Mondays) is a short walk from Frutigen station but make sure you get on the right train in Bern. If you board the one that uses the new tunnel (at 34.6km it’s currently the longest land tunnel in the world), you’ll whizz under the mountains to Brig. Take the slow train instead, the one that stops along the way and goes on to use the original tunnel from 1913.