Yes, they are S-L-O-W to germinate directly in the ground. If you sow seeds in the garden, wait until the night temps are stable at 50 degrees or more and days temps are as Herblady49 stated. That is why I said mine were slow to get started - I grew them from seeds! Of course if you buy the plants, well that's a horse of a different color. They are definitely a "warm season" plant. They did not reseed for me. If they made seeds, I didn't find any. None came up the next year. For me, that was a god send. I love MGs but they grow too da*ned well here and take over. They even climbed up into my weeping willow tree. It was pretty, but the blueberry plants underneath were bombarded with the seeds in late summer and what a pain that was...and still is. Zillions of seeds coming up in that fertile, moist soil. Aaah! Here is a link to my Sunflower Morning glory photo site: Here is a link that might be useful: Annie's Sunflowers and Morning Glories of Past Summers

My guess is that it has just fried. If it turned brown at the tips you could cut back. If it is brittle at the base, it has probably died.

Black Eyed Susan Vine (Thunbergia alata)is actually a tender perennial, usually grown as an annual. If it's in a pot, bring it in for the winter and keep it above 45 degrees. If it's in the ground, either save seeds for next year or dig it up.

What growing conditions are they in? They like lots of sun and even moisture IME. I've never grown salmon colored ones and am not growing any yellow ones this year to check how long blossoms last, but the years I have grown them, it's been in a large deep pot (more than 1' in all directions) in a sunny spot with regular watering. They are a bit slow to start, but by this time of year mine were generally multistemmed and most of the way up a 3'-4' trellis and covered with blooms. Since there were a lot of blooms, even if each individual bloom didn't last long, it still had lots of bloom. So I am not sure why, but yours seem like perhaps they aren't getting all they need or perhaps the salmon colored plants aren't as vigorous as the yellow and orange ones that I've grown. If you add info on your zone and location, it helps with questions like this since different plants behave differently in different locations. Here's how: Go to Your Houzz in the upper right of every page, click Edit Profile, and on the left side click advanced settings. Well down the advanced settings page is a blank labeled Climate Zone for Garden Forums along with a link to find your zone. If you add info on your state or the nearest large city you will get even better information since zone only relates to average coldest winter temperatures. Then return to the top of the page and click Done Editing.