Hello ES, thanks for getting back to me. I appreciate the basic information about passionflowers, I'm not at all familiar with the group and had confused Adenia and Adenium. It's always good to start at the beginning.
The plant is in a pot, in unknown medium but it seems to be remarkably hydrophobic whatever it is. Someone who worked there before me recalls it being there for at least five years with no attention. No one knew what it was. I've found a number of succulents there not doing well, potted in poorly-draining, compacted houseplant mix, some with a large amount of small-particle sand clogging the bottom of the pot. They compensated for this by only lightly watering the surface, apparently a common misconception about succulents. Also, this Adenia being severely chlorotic makes me suspect it needs proper medium to develop the healthy roots needed to absorb nutrients. I'd like it to be able to utilize the increased watering and feeding I'll be giving it. I have not seen the roots.
The greenhouse is tied into the circa 1910? steam heat system that serves the entire VA complex. (I'd like to see the boiler, but that's another story.) Temperatures are not tightly controlled, but seem to be staying between about 55 and 70F through the winter. There's a bit of a steam leak (or something) that keeps the humidity high all winter. I can't do anything about that, except by withholding water from the few winter-dormant plants.
In summer, the greenhouse is served by somewhat creaky evaporative coolers. Again, temperatures are poorly controlled, getting close to 100F at times, but it does keep the humidity up. I don't have an exact number.
The slightly warmer weather a few weeks ago, and slightly longer days seem to have triggered the spindly, chlorotic top growth, so I think it's time to start the increased watering and feeding.
Do you have this plant yourself? It doesn't seem to be common in cultivation, I can't find much information online. It took me a couple of weeks after the leaves came out to even identify it, but I'm pretty certain I have that right. I have no idea how it ended up in the greenhouse, but we do get donations of plants people are no longer able to care for, for whatever reasons.
I'm very grateful for any and all information and detailed recommendations you can share with me. I'd like to see those rampant vines this year.
Thanks.
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