Sow your sweet peas seeds anytime from October until March, two seeds to a pot. You can sow your sweet pea seeds in March but growing sweet peas over winter will produce stronger, more robust plants. Use toilet rolls!
I would much rather have wildflowers in a mason jar than an expensive arrangement from a flower store. Wildflowers make me think of the handfuls of flowers children would pick for their mother. Love the Kerr/Ball mason jar idea for floral arrangements.