Dylanr
All questions welcome!
Can't help you with the first two except that they died of thirst and exposure. Repotting an already stressed plant adds more stress.
Your third—lavender— needs more water and a bit more sun exposure if possible. It will benefit soon from deadheading. In the fall you might consider repotting it into its own slightly larger container with well draining potting mix.
Whereas you have a relatively stable "weather" environment when growing indoor houseplants, it is vital to respond to seasonal weather conditions when growing outdoor potted plants. Direct sun and wind are extremely drying. If your plants start to look stressed, increase watering accordingly ... they're thirsty!
