Thanks aurourawa, Do you recommend repotting now or waiting until the soil dries out? Also, take it off of its 2 trellises, for repotting? I don't want to damage the vines. I've got a yard that has no trees and just one small awning, in the patio area, that faces south and gets full sun for much of the day.

For now, I've moved them into the shaded area, just behind where they were, so they'll get mostly indirect morning light. There's no covering there. I may need to rig up some shade cover & that'd be easiest on the part patio that gets full sun most of the day. I blasted the leaves today, with water, because some of the webbing on a few of the leaves looked like it might be from spider mites. Could not see any with a magnifying glass, but I'll be keeping an eye out for them. It's so dry and dusty this time of year & the leaves were pretty dusty too. With the 2 feedings I mentioned in my original post, I can see some green coming back into the leaves, so that seems to be helping.

You can repot now. It actually helps to remove the old soil if you soak the rootball in warm water for a few minutes. If you are careful, you should be able to remove the plant, still attached to the trellis, from the pot. Then, just add an inch of your mix to the bottom of the pot, plop the rinsed plant, trellis and all, back into the pot, and cover entire rootball with your mix, tapping the pot gently against your work surface as you fill, to get the mix all around the roots.

For spider mites, if the blasts of water don't fully work, I have found a mix of vinegar or rubbing alcohol (1/4 cup) and a couple of tablespoons of baby shampoo, mixed in a gallon of water (shake well, then apply mixture to ALL plant surfaces and rinse after 5 minutes, KEEP IN FULL SHADE/INDOORS until completely dry) works well as an alternative to systemic. It may need to be re-applied/re-treated once a week for a few weeks, to rid the infestation.

If you'd rather go the chemical/systemic route, Forbid is a good, but rather expensive, miticide. Mantis Pro and Bonide are also really good and relatively cheap.

Thanks! I'd rather not go the chemical/systemic route. I'm repotting today.

When you say pine bark, do you sift out small pieces? Does it matter the size of the bark pieces? I use fines for houseplants. Interesting.

I sift, yes. All to between 1/4 and 1/8 inch pieces.