I bought a bag of budgie seed from the pet shop and put it on a feeding tray for the wild birds. Now, three weeks later, they have started to sprout. I have looked online to see what seed they may be but had no luck. Does anyone have any idea what seed they could be and if it would be worthwhile replanting the seedlings just to see what they grow into?
If you read the contents on the bag it will tell you what seeds are in it to give you a good idea of what will grow. We always by the non sprouting or no mess food to avoid the problem.
Hans beat me to it. A friend had a plant sprouted from bird seed growing in her garden. She knew what it was - just left it as a plant growning among other plants/flowers.
Strangely enough - about a decade ago I had a visit from the police following a neighbour reporting me for growing illegal plants in my front window. It was actually mimosa so we all had a laugh about it.
Some folk can be a bit sensitive regarding mimosa. ;-)
Was it a seed mix, or were all the seeds uniform looking ? If so it's likely to be a type of grass seed, which in my experience has a coarse broad leaf and not really that attractive.