“Bringing home a climber is like bringing home a new baby,” says a gardening friend of mine: you have to make sure that its new accommodation is ready and waiting. Annual climbers are no exception. Most make a tremendous amount of growth in a very short time, so you need to construct a sturdy framework before you plant.
If you are using bamboo, hazel, or other poles, shove them firmly into the ground at least 30cm deep, and ensure that all the bits are securely fastened to each other, the wall, or wherever you have anchored them to. We demand a lot from both sweet peas and runner beans, with our constant picking of flowers from the one, and pods from the other, so make sure that you incorporate plenty of garden compost, and (if you can get it) well-rotted farmyard manure into the planting hole. If not, use pelleted poultry manure. Nasturtium, canary creeper, morning glory and Rhodochiton are not such heavy feeders (in fact, nasturtium makes leaves at the expense of flowers in fertile soils). If your soil is dry, water the hole copiously before you put the plant into it.