Puna clavarioides likes a bright and sunny position all through the year, but can tolerate some light shade too but these Cacti grow better in full sun as long as they are protected from very strong heat.
A bright sunny greenhouse or a south facing window is ideal if protected from heat and sun scorch from glass on very hot Summer days.
Water well in Spring and Summer but ALWAYS allow the soil in the pot to fully dry out before watering again as these Cacti are very prone to rot if kept too wet due to their tuberous root systems.
Clean rainwater is always preferred if it is available, but tap water is ok as long as the Ph of your water is not too high ( above 7,5 pH ) Its always best to let tap water sit for 24 hours before using it to allow some of the chemicals to dissipate.
Keep this Cactus totally dry over the Winter dormancy period with no water given whatsoever.
Puna clavarioides likes a very well draining mineral soil as this cactus is very prone to rot due to the tuberous root system and a well draining soil is a must.
Feed Puna clavarioides in Spring and Summer every month with a Cactus fertiliser diluted at half strength, this is because this cactus is a slow growing plant and does not require lots of fertilising.