Posted: Yesterday at 19:59
Sweet peas should be outside, especially if you sowed them in early June. If they're individual seeds in a small pot, you can put them into a biggish pot together - I use around 6 to 8 plants in a 14 or 15inch pot. You can then put tall canes in for them to grow up, tying in with string to help them along, or winding the string round and up the canes to give a basic frame. Alternatively, put them in the ground with a suitable support - you can still use canes in a tripod there too. If they're not very strong, that might not be the best idea though. Slugs love them.
They need good rich soil, and some depth for their roots. As time goes on you can feed them too, or put some of that slow release food into the bigger pot when you plant them.
Mine look like this just now - they're about three feet or so. You can't really see the pot, but it's an 18 inch one with about ten or twelve plants.
This pot is about 14 inches, and has around 8 plants