Comments to my donation

Johannes-Ulrich Urban via pbs pbs@lists.pacificbulbsociety.net
Fri, 28 Apr 2023 06:50:45 PDT
Dear All,

Here are some comments on my donation for the current EU bulb and seed exchange.

Bye for now 

Uli 

Amorphophallus atroviridis:
Rare in cultivation. Beautiful deep green divided foliage with a pink picotee edge. Mottled leaf stalks. The flowers are relatively small and pale yellow, no evil smell, not really interesting. I had no seed set. Flowering tubers do not produce a leaf in the same season, the tubers on offer are not of flowering size. A striking foliage plant. Easy to grow in a warm spot with good light out of direct sunlight. Summer growing with dry winter dormancy, increases fairly well. 

Dioscorea discolor: plant the tuber as soon as possible on arrival and give gentle bottom heat. It will still be slow to sprout but without bottom heat it will take ages. Once started it will grow fast into a vigorous vine with beautiful foliage. Give good light to get good leaf coloration. Fertilize and water well, increases in number and size of the tubers. From Bolivia. Makes a robust house plant on a suitable trellis. Will go dormant fairly late in the year, keep completely dry then otherwise it will rot. 
Pictures in the WIKI 


Oxalis elegans:
From Ecuador, summer growing and winter dormant. Beautiful colour combination of deep pink flowers, a green centre which is surrounded by a deep purple ring. Attractive foliage as well. Some bulbs were given to me more than 20 years ago by a friendly gardener of Göttingen Botanical Garden. I have given it to as many people as possible. So I could get it back after I lost it. With others of my summer growing Oxalis it succumbed to a fungal rust infection towards the end of summer when the weather turned damp. That was before I moved to Portugal. O. elegans is slow to increase and does not like hot conditions, so I am not sure if I can maintain it in Portugal. Give it full sun but make sure that the pot does not get hot. It seems to be very rare in cultivation.

Oxalis stipularis or decaphylla.
Received very many years ago from a friend who collected it in Mexico but without a name. Summer growing and winter dormant. This one is easy to grow and makes a very attractive pot plant. The foliage is the interesting part, very finely cut into many branching segments. Small pale lilac flowers. Increases easily. Rare in cultivation as well. 
Pictures of both of these oxalis are in the WIKI 


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