Violas - My Favourite Weed?

Weeds. ⁠
There are always going to be some when there's an acre of flowers & to be honest, it's only the really pernicious ones I bother about. ⁠ After all, if a weed is simply a plant in the wrong place, anything has potential to be a nuisance. ⁠
But there are 'weeds' you can't help but love & allow space in any garden.⁠ Forget me nots, for example - give them an inch & they'll smother a whole bed. Turn your back on a seeding Foxglove & you'll have them forever! ⁠
I don't mind either as they're easy to remove when they become too much, & are loved by both bees & this flower grower. I give both space here. And of course, regularly cut them for arrangements!⁠
Viola's are another of my favourite 'weeds' - I let them self seed & over generations, they've developed quite a range of colours & shapes around the place.⁠ These are some of the polytunnel 'weeds' - tucked in beneath the Sweet Peas.
In the soft light, they grow tall & so are surprisingly useful. Often I cut them for bud vases & little posies as they last well in water.
​I would rather see these growing than bare earth or let more tricky weeds establish in the space⁠ What's your favourite 'weed' to encourage in the garden?