I have Triste. I've been growing this plant in my yard and in pots for over
20 years now. The secret to growing this plant is to water it in the winter
time, let the bloom, let it seed then stop watering it all together for a good
five months. This means total dormancy in the summer months.Forget that you
have this plant during this time. By October, check your plant out, say hi to
it, and, give it a little water. As the fall season draws nearer towards
Winter water more. Never over water this plant, always let the water drain out
of the pot well in between each water sections. This plant can still die from
over watering even when it's out of dormancy. Standing water kills these
South African species.
So, as soon as the foliage starts to appear ( it's starting to come out of
it's dormancy) water regularly for a month, pulling away sightly the watering
routine. When seed production is in full swing stop watering. Right now my
P.Triste's are in bloom. By June, I will no longer water the potted plants.
Those P. Triste's that are in the ground are totally watered by our natural
rain fall. We have almost no rain in the summer so they are very happy
naturalized here in Southern California.