Growing Streptocarpus

[Fuerte Rav]

I grew Streptocarpus for years in the UK and was sorry to leave them behind. I was delighted to see some for sale in our supermarket style garden centre a couple of weeks ago and treated myself to three. The problem with that garden centre is that the plants they sell are not always suited to our climate and/or they all get treated the same while on sale. Orchids, fruit trees, herbs, African Violets: they all get soaked, and I mean soaked, from above by a hose every morning. I've learnt to buy within a day or two of the plants arriving! At least the whole place is completely shaded and their watering methods mean the humidity is always high.
So, the Streps looked a bit sad when I got them home but recovered within 48 hours. We then had very high temps, day and night, for 4 or 5 days and very low humidity. Today when I checked them I found some patches of something nasty on the leaves of all of them. Not all leaves thank goodness. I trimmed the leaves to get rid of all the nasty stuff but I wondered if anyone knows what it is/what caused it. Since I got them home I've had them in the same area as my phals, so shaded natural light, warm/hot (28-48C) 24 hrs, good air movement and I water when the pot gets quite light in weight. I never had these kind of temps in the UK so I'm not sure if it's just too hot for them.
Any thoughts welcomed!

[estación seca]

48C is impossibly hot for them. 35C is borderline. That looks like heat damage. Put them in your coolest spot.

[Fuerte Rav]

Originally Posted by estación seca

48C is impossibly hot for them. 35C is borderline. That looks like heat damage. Put them in your coolest spot.

oops, thought it might be. Thank you.
Unfortunately the extreme temps (48C) were unavoidable, every room in the house was the same, nightmare! But as a result we had an AC unit fitted today for the lounge so we can at least get some respite in future calimas. I'll remember to bring them into the lounge when the temps spike again and in the meantime I've moved them to my north facing (phals in bark) room which stays a little cooler than the south facing (phals in SH) room.

[Dollythehun]

Just my two cents: I'm sure ES is correct, however, I notice the oldest leaves on my strep just start looking crummy. I keep it trimmed and divided since they seem to only bloom on new growth. It often gets to 80f in my sunroom.

[Fuerte Rav]

Thanks Dolly.
I've forgotten most of what I learnt about Streps in the years I've been living here
I remember propagating by leaf cuttings but I can't remember in what season. Do you do this?

[estación seca]

48C = 118 F

[Fuerte Rav]

Originally Posted by estación seca

48C = 118 F

tell me about it - gasp!

(the tarmac road melted outside our house, luckily our cars were on a grava (lava chunks) parking area.)

Our island is only about 20km wide where we are but our temps on the west coast were 10C higher than the east coast. The wind/calima came from the east so I can only presume it picked up heat as it travelled over the 20km of land.

The garden has suffered very few calamities thankfully. Quite a few leaves have dropped but the plants themselves seem to be recovering well. Just typical though that all but one of the blooms on my Dragonfruit/Pitahaya came out after dark on one of those nights and died before dawn.

[Dollythehun]

Originally Posted by estación seca

48C = 118 F

I have an app to convert that. But I was sitting in the veterinarian's office with Yogi. I won't say metrics are beyond me, but it's close.