Chris Yes, pls. number them, take individual photos, or at least just 2-3 per photo. And try to get more of close-ups, some are very small to ID. Succulents need very similar care: fast draining potting mix, containers with drainage holes (hope all of yours have it), very good light - many will do best in good sunlight. And letting us know your general location or at least a growing zone would help. Best if added to your name.

Sorry but this one is not a cut and dry answer. Any chance you can narrow it down? To me it looks like any one of about 50 various Jungle Jacks Varieties. Its pretty so maybe just enjoy it for whatever it is and maybe the answer will present itself in the future. I know I have been able to find lost varieties (after my garden pixies removed all the plant label stakes 6 years ago) by at least having all the varieties on an spreadsheet and then taking inventory and verifying blooms.

Yup, agreed on the ID. You could probably take cuttings a few nodes long & pot them back into mother plant's pot, to make it look even more full & lush.

Taking hardwood cuttings in autumn is the simplest way of propagating philadelphus (and deutzias, weigelas, spiraeas, exochorda, roses...any deciduous woody shrub. Doing exactly what Floral suggests, simply poking an 8- 10 inch length of woody stem (about as thick as a pencil) into the corner of a nursery bed is slow but reliable. Semi-ripe cuttings, taken now(ish) require a bit more care but will root in as little as 6 weeks. I generally use pots because I just put a soda bottle over them, so it becomes an enclosed mini bio-dome. After an initial watering, to just moisten the potting medium, no more water is needed until roots appear - I put mine under the greenhouse bench where they are out of direct sun...and generally ignore them for a few weeks.