All willows produce catkins - it's how they flower. But some of the showiest of the genus are the shrub willows, a number of which are grown specifically for their spring catkins. All like moist soils but many will tolerate regular garden soil as well.

Salix caprea
Salix discolor
Salix discolor 'Rosea' - pink pussy willow
Salix chaenomeloides 'Mt. Aso' - giant red pussy willow
Salix gracilistyla 'Melanostachys' - black pussy wilow
Salix sachalinensis 'Sekka' - fantail or contorted pussy willow

Routine harvesting of the catkin-bearing stems as they appear in spring will keep all of these willow shrubs at a mangeable size.