Nasturtiums are well worth the money

[sparrow100]

I love 'em too - and the leaves/flowers/seed pods all get used by us. Must get some started!

[PyreneesPlot]

Glorious photo.

I have them self-seeding all over the veg garden and just move the seedlings around to where I want them. They make good ground cover under the tomatoes and the like, and at the end of the season they collapse and protect the soil.
Pretty, useful and edible

[SkyChild]

Yup, love 'em. Hubby's a convert too once I pointed out they were edible and pretty. Excellent groundcover for us too to hide the bits we haven't dug yet XD

[Bohobumble]

Mine are always covered in black fly which puts me off eating too many

They start a leaf at a time, so long as you nip that leaf out and dispose then they don't become infested and no issues in using for salads or sandwiches - it's a great way to keep blackfly off the rest of your plants too!