Container guide
Growing porcupine grass in a pot
Compost and drainage
Porcupine Grass needs sharp drainage, so this matters more in a pot than in the ground. Use a free-draining mix (add perlite, grit or bark to standard compost), always pick a container with drainage holes, and never let it stand in a saucer of water.
Watering porcupine grass in a pot
Containers dry far faster than open ground, so porcupine grass in a pot needs checking more often than the general guidance of "Weekly during the first growing season; once established, every 2–3 weeks or during prolonged drought." — especially in summer, wind, or a heated room. Check the top few centimetres with a finger rather than watering on a fixed day.
Potting on
Pot on when roots show through the drainage holes or growth slows noticeably — usually every 1-2 years for a plant this size. Move up one pot size only; jumping several sizes leaves wet compost the roots cannot reach, and that is what rots them.
More porcupine grass care
Growing porcupine grass in containers — FAQ
Can you grow porcupine grass in a pot?
Yes — porcupine grass grows well in a container, but it needs a substantial one. At about 2.5 m mature it wants a pot around 30-40 cm (12-16 in) across to stay stable and hold enough compost to buffer moisture. Go too small and it dries out constantly and blows over.
What size pot does porcupine grass need?
Aim for a container 30-40 cm (12-16 in) across. Pot on when roots show through the drainage holes or growth slows noticeably — usually every 1-2 years for a plant this size. Move up one pot size only; jumping several sizes leaves wet compost the roots cannot reach, and that is what rots them.
What compost and drainage does porcupine grass need in a container?
Porcupine Grass needs sharp drainage, so this matters more in a pot than in the ground. Use a free-draining mix (add perlite, grit or bark to standard compost), always pick a container with drainage holes, and never let it stand in a saucer of water.
How often should I water porcupine grass in a pot?
Containers dry far faster than open ground, so porcupine grass in a pot needs checking more often than the general guidance of "Weekly during the first growing season; once established, every 2–3 weeks or during prolonged drought." — especially in summer, wind, or a heated room. Check the top few centimetres with a finger rather than watering on a fixed day.