How to Fertilize Opuntia robusta?
Balanced feed in spring and light repeat in growth season

Opuntia robusta · Opuntia robusta
Under glass grow in sharply-draining loam based compost (JI No2) with added sharp sand or perlite, or a proprietary cactus compost. Provide full light at all times and allow compost to dry before watering during growth period in spring, summer and early autumn and apply a balanced liquid fertiliser three or four times. Withhold water and fertiliser in winter when dormant. See houseplant cacti and succulent cultivation for further advice
Balanced feed in spring and light repeat in growth season