Need advice about Ptycosperma elegans

[dalmatiansoap]

I have two seedlings and I can't figure their growing needs in winter time and I must say they are tricky for me even in summer time. When first temperature drops they got these fungus marks and slowly start to decline. I'm not sure if they need overhead protection due high dew .....?

Daily temperatures are usually between 13 and 17C, night drops about to 5-10C.

Would moving them inside help? I'm afraid of spider mites infection 

[Phoenikakias]

Ante, IMHO clearly cold damage, probably combined cool weather combined by too moist soil and high air humidity. What is the substrate in the pot? If they show already cold stress, their survival through winter is not certain. I fear a lot indoor conditions when substrate is mainly soil with organics, because inside the house what misses frequently during winter is enough fresh air, which dries out the substrate. Put to the equation inadequate light and you have perfect conditions for diseases. Like I had recommended to another PTer, better place the pot on a sunny window sill and provide some root warmth through a heating pad. Replacing the substrate this time if the year (and the following one) is a BIG no!

[dalmatiansoap]

It's mainly compost. Third year same winter stress. They recover during summer but not enough to speed growth normally.

[gurugu]

I keep mine outdoors on the dry side all winter long. They like fresh air and rain on the leaves, but not in the soil, which is a perfect puzzle. He who finds the key, is the winner.

[Phoenikakias]

36 minutes ago, gurugu said:

I keep mine outdoors on the dry side all winter long. They like fresh air and rain on the leaves, but not in the soil, which is a perfect puzzle. He who finds the key, is the winner.

I did, but I really do not claim any win!

[gurugu]

12 minutes ago, Phoenikakias said:

I did, but I really do not claim any win!

How did you manage?

[Phoenikakias]

Lighter substrate partly inorganic. It may take more time for the plant to develop a bound root ball, but eventually it does so. Dilemma,  which actually there is no dilemma, is use peat for substrate and add artificial heating or risk root rot without heating.