Tuberous Species


Hello Cindi,

A good idea to give the opportunity to join the San Diego meeting virtually.
Would you be so kind to ask the following questions to Michael Vassar?

1. P.anethifolium & P.reniforme.
P.anethifolium forms a chain of tubers of different sizes up to 2.5 cm. The
plant is grown in a terra cotta pot of 15 cm in a poor mixture of potting
soil and gravel. In summertime the plant is dormant. In september it starts
producing a stem of 25 cm with sharp pinnate leaves of up to 5 cm. It does
not come to flower. How can this plant come to flower?
P.reniforme, grown in the same condition as P.anethifolium, is also
tuberous, has rounded, slightly lobed leaves and gives nice purple-blue
flowers.
Can you say something in general how to handle these species for optimal
result?

2. G.tuberosum & G.malviflorum.
Two early flowering (april) hardy geraniums with deeply cut leaves.
G.malviflorum has tubers with several buds. G.tuberosum has tubers with less
buds, going more to the form of a bulb, which it not is.
G.tuberosum is later with its leaves then G.malviflorum. Flowers are
similar: purper-rose with darker veins. Both plants are dormant in summer,
but G.malviflorum keeps its leaves longer then G.tuberosum.
Are these differences correct or am I perhaps confused with other tuberous
species like G.macrostylum?

Many thanks in advance. Wishing you all a good meeting in San Diego.

Rein.



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