I’m really, really trying to get into saving my own seeds but with all there is to do in the garden (let alone life!) my timing is sometimes off. Either I’m over eager and lop off the seed heads before they have fully matured, or find them too late, after their seeds have already dropped.
I don’t remember who taught me this little trick to avoid disappointment, but it’s a good one.
Get your hands on a bunch of little mesh gift or favour bags. Dollar stores are a good bet, or attend a lot of fancy weddings and beg them from everyone who has finished their candy. When you notice the seeds forming on plants, pop a bag over the head and tighten the ties snuggly around the stem. The bag will keep the seeds contained until you get around to harvesting them, and allow air and light to circulate in the meantime. They also dry very quickly if they get wet.