Finally, weave in two further groups of laterals on each side, using double (16-inch) intervals for a secure arch.
This sweet pea arch can be used to divide a section of your garden or just to fill dead space with a hint of florals.
When to sow sweet pea seeds
Of course you’ll need sweet pea seeds for this gorgeous arch to look just like the one at Highgrove – and the timing couldn’t be better to secure your arch before sowing season.
When it comes to sowing your seeds, there are three ways you can get them going.
One method is to start them indoors in late winter/early spring roughly 8-10 weeks before the last frost, or directly outdoors early in the spring around six weeks before the last frost.