Climbing plants have large ish roots and to be honest, roses are fairly gready plants, more so the climbing type as they have to put on lots of growth, foliage AND flowers all in one season then they need to make nice new roots to contend with the extra hight (longer stems) they have made at the same time, so I am not too surprised that the Plant is looking a bit sad and forlorn.
Now you have a home with a garden, I think you need to get used to growing things in the garden soil, they will be easier to care for and will be able to grow healthy roots without any restrictions from the sides and bottom of pots.
Pots also take much more watering as the soil will be drying out, especially in Zone 10, and don't forget, the heat will warm up the pot and there's every chance the water you give the plants will not really reach the roots as dry soil has a crust on it and there's every likely-hood the watering will just run right through and out the base of most pots.
For perennial plants like Roses, clematis and other climbers and most perennials, they need a rich soil with humus added to the planting holes, this adds air and nutrients to the soil around the roots and also feeds the plants too.
I would be starting to plan any borders, beds or any other outdoor larger garden areas you wish to grow plants in, amend the soil as you turn it over in the new beds / borders etc by adding as much humus /horse manure ect as you can lay your hands on (most people who keep horses are glad when people take the manure away, just make sure the animal manure is well rotted, it should have no smell, when rubbed in your hands it should crumble like soil and look like good quality soil, as you make your border / beds, lay about a 6 inch layer along all the newly dug soil and then fork this into the soil, next time you dig you should notice the difference in soil quality, it will retain more moisture when you water and feel light and airy as you dig for planting.
Each autumn I add another layer of humus onto my border soil as it helps retain moisture, keeps weeds away and enriches the soil for the next seasons growth.
Hope this helps you get started with your new gardening adventure as once you gain some new experiences, your confidence will grow too, and any mistakes will be easier to find and rectify as you go along.
just be patient as plants will only grow well when they are in the right environment to suit there needs, like plenty light or shade, and you will learn from labels books/ magazines ect just how to grow all the different things you want to grow.
Good luck Ginny, don't give up on your new found joy, we all had to learn somewhere.
Best Regards. WeeNel.
