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Can someone tell me what plants these are that randomly appeared in my seed starting tray (I did not plant these)

The one to the left looks like a begonia to me...

AnnaIkona wrote:The one to the left looks like a begonia to me...

What is a begonia and how big does it get?

There are several types of begonias. They are flowers that grow well in containers. They must be watered daily and while it's still young, avoid too much (or direct) sun light. These flowers can even be trimmed to the very bottom for winter, brought inside, covered with a plastic bag and when it's summer again, planted outside. These flowers are generally pretty hardy.

It won't get too big. I think a 20 inch pot is good enough.

AnnaIkona wrote:There are several types of begonias.

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They are flowers that grow well in containers. They must be watered daily and while it's still young, avoid too much (or direct) sun light. These flowers can even be trimmed to the very bottom for winter, brought inside, covered with a plastic bag and when it's summer again, planted outside. These flowers are generally pretty hardy.

It won't get too big. I think a 20 inch pot is good enough.

But like how did it get there ?

I have not idea I may be wrong...it may not be a begonia. But I honestly think it is. Maybe the soil you added to the tray had some seeds in it?...

AnnaIkona wrote:I have not idea I may be wrong...it may not be a begonia. But I honestly think it is. Maybe the soil you added to the tray had some seeds in it?...

It's got a lot bigger and is not a begonia it has dark purple coloured berries.

Not begonia, but probably some kind of weed. The one on the right is probably purslane, an edible weed.

Weed seeds are ubiquitous. Even supposedly sterile potting mixes will often have some.