I had an indoor Streptocarpus plant given to me in January. It bloomed for a while & I pinched off dead blooms. Since no blooms have appeared, should I pinch off the stem where the bloom was, as some of the stems are now brown. I may have given too much water, don't know really what I have done wrong Also, should I water from the bottom? I just re-potted with fresh soil. Thank you.
I think you may have overwatered your Streptocarpus. They like to have a well drained soil, so make sure you have used a well draining potting mix. I would not water from below, just simply water around the pot when the soil has dried slightly.
Here is a few links to more information on how to care for your plant.
https://www.gardeningknowhow.com/houseplants/streptocarpus-plants/care-for-streptocarpus.htm
https://www.gardeningknowhow.com/plant-problems/disease/leaf-browning-in-center.htm
Why do streptocarpus leaves wilt when not in need of water?
Warm summer temperatures will cause them to collapse.
Simply move them to a shady location and they will revive in the evening.
Do not overwater.
https://www.gardeningknowhow.com/houseplants/streptocarpus-plants/care-for-streptocarpus.htm
The leaves on my plant often turn a fuzzy gray/brown on the very ends, while the rest of the leaf stays brown. What makes this happen?
Low humidity causes the leaf tips and edges to turn brown.
For more information on streptocarpus, please visit the following link:
https://www.gardeningknowhow.com/houseplants/streptocarpus-plants/care-for-streptocarpus.htm
What fertilizers do they use.Flowering or winter and how can I keep downy mildew at bay. I am currently using Physan 20 when I feed them(once weekly)?
Fertilize with caution. A light (cut in half) application of a balanced fertilizer every few weeks during active growth. Flush the soil every so often to avoid excess fertilizer build up.
https://www.gardeningknowhow.com/houseplants/streptocarpus-plants/care-for-streptocarpus.htm
This link has information on the control of Downy Mildew
https://www.gardeningknowhow.com/plant-problems/disease/downy-mildew.htm
What PH do they like
Soil should be neutral heading slightly towards alkaline ph 6-7.
https://www.gardeningknowhow.com/houseplants/streptocarpus-plants/care-for-streptocarpus.htm
I was bought 6 streptocarpus plug plants in mid march. We potted them up as instructed, and have them in a light cool room. They just aren't growing and they look just the same as they did 2 months ago. HELP.
These aren't exactly super fast-growing plants, so if the light and soil conditions aren't "just right," it's not surprising that the plants don't appear to be growing. They also may simply have been in dormancy and are getting a slow start on the growing season. Double-check your watering schedule, soil mix and lighting situation. This article may help you, and it also contains a link to some good information on what kind of planting medium this plant likes:
https://www.gardeningknowhow.com/houseplants/streptocarpus-plants/care-for-streptocarpus.htm
How do you prevent the leaves going brown round the edges?
Streptocarpus are in the same family as African Violets, Gesneriads. If the leaves are dry around the edges you can place a tray with rocks and water below the pot to increase the humidity. If the edges are moist and rotty, then this could be associated with your watering method. Avoid getting water on the foliage and if possible water from the bottom of the pot.