Grass....gorgeous Grass! Growing Grass for the birds?

In 2008, quite a few of the uneaten birdseed in my Fennel planter (aka birdtable) germinated into what looked like Oats as you can see below.
One of part of the -eaten-germinated seed

The House Sparrows especially loved tis extra treat, and the seeds were eaten in quite comical manner. The Birds would hang from the Fennel stalks; with my Fennel growing around the (free) birdfood, they would really hang into all directions, and fight off any other bird which was coming too close.
In my attempt to treat the Gang (my House Sparrow colony) to these seeds again, in 2009, I spread the seed around the Fennel on purpose, from spring. no luck really.

This year, many seeds must have been dropped by the birds themselves and I see "Grass" (which can be anything) everywhere; in my Azaelea pots, in the Fennel planter, and underneath the planter and shelving. As I loved to sketch Grass, I took the camera to it, this time.

Growing in the planter and in about every pot at my kitchen door are these;


I am sure that my birds are going to love these seeds!
















Here you can see the Fennel fronds and the grey stalks. And the fat grass seeds growing right in front of it.


On the outside of the planter is a lot happening too. Tgis picture is from the beginning of June;
A Common Vetch (the purple flower) has found a way in, also.

By now, 10 days later, this plant has grown coniderably and I have no idea what I'm dealing with here. Has it anything to do with birdfood at all?

These leaves are quite thick.


These yellow flowers are part of it/them too, I believe.
As long as the Bees are happy with it.
I hope these leaves/plants will produce bird food too? Perhaps it comes from those little "pea/lentil"-like seeds?


Female Chaffinch, Fringilla coelebs.
My little Chaff doesn't care really what or who is growing here; as long as she can still find food!
The same for my Blue Tits.