As has become a tradition, the For a More Beautiful Ljubljana campaign kicked off on 22 March, World Water Day, and will continue until 22 April, celebrated internationally as Earth Day.

Aside from being encouraged to clean up any rubbish lying around and to beautify their surroundings in other ways, the locals are also invited to help plant new trees and remove invasive species.

One such is a campaign to remove Japanese knotwee from the recreational areas along the Sava river on 23 April. Rather than burnt, the removed knotwee will be used to make paper.

The city's waste collection utility, Snaga, will have a team on standby to respond to calls by participants in the clean-up activities. These will also be offered free plastic bags and discardable gloves.

The city's water and sewer utility will remove dozens of sick and damaged trees from the local conservation areas to replace them with more than 120 saplings of indigenous pest-resistant varieties of wild cherry, walnut and oak.

The employees of the city administration and city-run institutions and companies will resume last year's campaign designed to plant over 12,000 trees, one for every employee.

Locals and visitors will be encouraged to drink tap water by means of an innovative gadget that will enable the user to fill up their glass or bottle with the power of thought.

Individuals will also be able to contribute by taking shots of water motifs in a photo competition. Selected photographs will be displayed at the open-air gallery in Jakopič's Promenade in the summer.

The river running through the city will not be neglected in the clean-up efforts. Divers, fishermen, firefighters, boatmen and other locals will make a joint effort to clean up the Ljubljanica on 23 April for the 25th year running.