I've had Taccarum weddellianum since 2005,
every year it produces a leaf and usually a "baby" tuber.
But... it doesn't grow in size almost at all,
although the tuber very slowly increases, the leaf is 20-30 cm tall every year.
I use regular pot soil, and the plant is fertilized
with natural biohumus.
It grows in a southern window.
When it's dormant I store it without soil in the
normal room temperature.
What do I do wrong? What should I do to make it
Here are photos of my plant: