I am in zone 4/5 in the interior of B.C. We have hot summers and cold winters. We are 500 ft. above sea level so somewhere in between you and Pieter on the coast. It is generally in the 80's and 90's all summer with little rain. I am able to water as much as I need to becasuse we are on a well that never seems to run out. I've been gradully moving plants into more and more sun because of the need for more room and also to encourage those not doing well to actually grow. Over all I've been surprised and pleased that most plants grow well in the sun or at least hold their own until late in the season. The best in my experience are: Abiqua Recluse - an amazing gold that glows and catches the eye from across the garden. Paradigam - I also have a Pauls Glory in the sun but Paradigam holds up better. Inniswood- does just as well as Paradigam but the two are distinctive enough that I would always want both. Touch of Class and June - both look perfect and still have some blue color showing. Old Glory - the color is very light but no sun damage after 3 years in the hot afternoon sun. Carolina Blue - still blue Guacamole - grows well but color is muted Holy Mole - I moved it into more shade since it didn't seem to look as well as the others did Stained Glass - really beautiful but mine is in a bit less afternoon sun than the others Carolina Sunshine - just noticed the margin is turning orange, wonderful! Sunpower family: I agree that Sunpower in lots of direct sun does get crispy about now. Some of it's sports like Abba Dabba Do, Paradise Power, Zippity Do Dah, Atlantis etc. hold up much better in sun. A last yellow that I'm growing to love more and more is Aspen Gold. It's a slow grower but the round, pebbled leaves are really distinctive. The key for me is water. When we are having a really hot spell I leave the water on for days at a time. (drip system). That is for the ones in afternoon/evening sun at the height of summer. I have also grown some hostas in pots on a west facing balcony. The sun blasts them from about one or two o'clock until it sets at ten. It's like being in an oven. What worked the best was placing them in a dish of water to see them through the day. I made sure they were always sitting in water over the summer. A Patriot there looked perfect all summer while one in the ground with mid day sun but late afternoon shade looked ratty by fall. Good luck.

Be careful with yellow. It always looks more yellow than those innocent paint swatches. Ask me how I know. LOL Choose the absolute palest version you can find. A friend of mine bought quarts and painted poster board with each color. Then she tacked it to the wall in her kitchen. That gave her a large swatch and good enough idea about how each color would look. It got expensive, so she chose her paint colors carefully. My next door neighbors painted their living room in a very pale yellow, and it is beautiful. It is the color of a banana, NOT the banana peel, but the edible banana part. Very soft and cheerful.

Thanks, gardengal! I was leaning towards oxalis, then I examined the front flower which seemed off (which I now believe was damaged by insects or not fully open) and the sprawling stems had me thinking vine! I do think it is Sunset Velvet with lots of sun exposure based on the google search I did. Appreciate your help!

Yellow can be a tough color to maintain on a Hosta as it depends so much on the lighting. Too much sun and it bleaches out. Not enough and it doesn't stay bright yellow. Orange Marmalade and Forbidden Fruit do not stay yellow. Autumn Frost can if its planted in mostly shade, but still gets dull later in the year. What size Hosta is she looking for? Grand Tiara stays yellow and green for me (if she wants a small Hosta) and I expect Emerald Tiara does as well. Dance With Me and Summer Breeze are great choices in a medium, but I don't grow those. How about Afterglow or Goodness Gracious (those might not be considered bright yellow) or Wolverine? Victory or Majesty. I guess there really are quite a few.