The leaves on my cardinal climber vine are turning yellow and brown. Vine is planted in a planter.
Yellow leaves generally are an indication of a watering issue.
To much or to little can cause yellowing leaves and if the plant sits in soggy soil or the roots dry out, eventually the leaves will die and turn brown.
Check the pot soil. Does it feel wet? The soil should be moist but never soggy. The soil should be well draining and the pot have an adequate drainage hole.
If the soil is dry, water. With warmer summer temperatures you will need to water twice a day if it is 85 degrees or more.
Cardinal Climber Vine is generally pest free but can be bothered by White Fly. If you see any little bugs, treat with Neem Oil.
Will cardinal flowers come back next year or do new plants have to be obtained? Should the plant be cut off at the ground or leave it alone?
These are perennials, and they will also tend to self-seed if they flowers are left on after they die. You may either cut the dead flowers off or leave them, but it is not necessary to cut them down.
Here is an article for more information: https://www.gardeningknowhow.com/ornamental/flowers/cardinal-flower/growing-cardinal-flowers.htm
will cardinal plant live on the edge of a pond in southwestern Florida
Cardinal flower loves moist soil but does not like to be in wet soil during winter dormancy which may cause root rot. . It is also a short-lived perennial so must be encouraged to self-sow. It is gorgeous and loved by hummingbirds and hummingbird moths like the sphinx moths. To attract wildlife, make sure to plant at least 3 of them. An isolated plant won't be worth the trip; hummingbirds are looking for larger feeding areas. Or combine cardinal flower with bee balm which hummingbirds also visit. So the answer to your question depends on soil moisture levels in winter.
I have purchased cardinal flower plants a dozen times. They never survive. Even the initial season. Never had one, reach blooming status. I've tried every soil type. Inground, in planters, in varied location. NO SUCCESS. Tell me why. I also have little success with a wide variety of purchased perennials: I read everything, available. No luck. Help! Please. Contrary, I have tremendous success with several perennials.
You aren't alone in having trouble growing cardinal flower. It must have damp to wet soil in summer but the same conditions will kill it in winter. In areas with hot summers, provide shade from the afternoon sun. Where it is happy, it will self sow; otherwise, even in optimal conditions it will only last 3-4 years. My neighbor has a lovely lupine. I can not get it to grow. Every yard has several "micro-climates" and if yours doesn't have a good match for the few plants that are this fussy, then maybe it is time to stop trying cardinal flower. As long as you meet the plant's basic light and moisture requirements, having trouble doesn't mean you aren't a good gardener. It just sounds like a poor fit for your garden conditions. Try cardinal vine; it has lovely red flowers that hummingbirds love.
Every year my cardinal flowers seem to get very tan at the base of the plant, and then the whole plant wilts and eventually dies. Can you tell me what the problem is and how to correct it?
It is likely to be a Pythium root rot. This infection will remain in the soil.
This article will help: https://www.gardeningknowhow.com/plant-problems/disease/root-rot-in-garden-plants.htm