You can make a tepee trellis with twigs or bamboo, or buy a pot-sized obelisk. Evison says he’s grown patio clematis on a column of poultry wire and inside an old bird cage placed over a flower pot.

'You should use a trellis if you’re growing climbing and vining plants that normally need support in their natural habitat,' explains Vladan Nikolic from Mr. Houseplant. 'A trellis stabilizes the ...