Trojská

Trojská is a small but ecologically remarkable nature reserve in Prague's Troja district, established on 1 September 1982. Covering just 1.27 hectares, it is an easy stop for visitors who want to see the northern part of the city beyond the usual attractions of Troja Chateau or the nearby zoo. The reserve sits on a steep, south to south-east facing slope between Trojská and Nad Trojou streets, right above the ravine that Trojská street runs through.

Why was it protected?

The reserve was created to protect communities of thermophilous grasslands and shrublands growing on outcrops of slate from the Šárka Formation, dating back to the Lower Ordovician period. These grey-black rocks, which in places break through the surface, form the so-called rocky steppes — two separate patches on steep, sun-exposed slopes that have long favoured plants and insects adapted to dry, warm conditions.

What can you see there?

The rocky steppes of Trojská host vegetation typical of dry, nutrient-poor habitats. Each June the reserve comes alive with the blooming of the Gallic rose (Rosa gallica), instantly recognisable by its deep purple flowers. Alongside it grow several orchid species and Hungarian yarrow. This mosaic of dry grassland also supports rare insect species, for which these rocky, sun-baked slopes are among the last refuges within the city limits.

How Trojská fits into the surrounding area

The reserve forms part of the larger Drahaň-Troja nature park, a group of ecologically valuable sites in the northern part of Prague. Trojská street itself, which runs along the border of the protected area, is the historic main axis of the Troja district — an old road connecting Kobylisy and Troja that has carried this name since the early 20th century. It's a reminder that nature and settlement history are closely intertwined here: the rocky steppes survived precisely because the steep slope was never suitable for building.

Who should visit?

Trojská is a rewarding stop for nature lovers and photographers looking for something beyond Troja's standard sights. A visit pairs naturally with nearby Troja Chateau, Prague Zoo, or the Prague Botanical Garden, all within easy walking distance. Late spring and early summer are the best times to come, when the Gallic rose and orchids are in bloom and the rocky steppe landscape is at its most striking.

Frequently asked questions

Is entry to the Trojská reserve free? Yes, the area can be visited on foot free of charge, but as a protected natural site it should be treated with care — stick to marked paths and avoid picking plants.

When is the best time to visit Trojská? June is the most rewarding month, when the Gallic rose and orchids bloom, though the rocky landscape is striking year-round.

Is Trojská connected to Troja Chateau? Not directly — it's a separate natural area, but it lies close to the chateau and other Troja attractions, making it easy to combine both in a single visit.