I love Streptocarpus, but I am new to growing them. I went a little crazy last month and bought four on Ebay. They arrived in 2 inch pots with blooms on them. Two are doing great, one is so-so and one appears to be rotting at the crown. I pushed the soild down around the crown and put pebbles and I am letting it get almost wilted between watering but the leaves are turning brown. Any miracle remedies?
I am wondering if I should take a cutting in case it croaks? What propagation method works best for you that grow them? Whole leaf? Sections? Soil, water? Cover or no?
Definitely take a leaf or two and for propagation. The most popular method is to take the leaf, cut away the midrib and put the halves cut side down in some moist propagation mix (Perlite/Vermiculite 1:1 for example). Put in a plastic bag and wait for the plantlets to emerge. There are plenty of how to videos on YouTube.
A lot of times when you buy a plant, the mix is too soggy and heavy. If that's the case, repot into something lighter (AV mix/Perlite 1:1 for example).
I agree with Olaf.It's definitely rot.I would cut any healthy leaves off and propagate them.Knock the plant out of the pot and see if there are healthy roots.If there is green crown growth above the rotted part you can cut it off and reroot it in barely damp lean mix.
Another leaf rooting method is to plant each leaf in it's own Solo cup in damp mix,then dome.You will only get 1 baby per leaf using this method though.
That's what I usually do when I bring in new streps . . . take leaf cuttings and put them down. 8 out of 10 times new streps do not make it in my apartment, mostly I'm thinking due to different growing conditions. But, the babies from those leaf cuttings almost always grow nice and strong. Then, if the parent plant makes it, great! If not, I've got the babies.
The first one I ever tried last year died from overwatering. It took me almost another year before I'd brave a second try. DON'T GIVE UP PLANTMUM6, just go light on the potting mix and let the soil dry before watering again.