Where do Rainbow Seeds actually come from?

The clue is the sky, not the shops. Rainbow Seeds only show up during the Rainbow Moon, a nighttime weather event that can appear while you're playing. You won't spot them on an ordinary Seed Shop refresh, so don't waste the whole session waiting by a counter. Keep an eye on server messages and the change in lighting instead. If you already collect Grow a Garden 2 Items, it helps to leave a little inventory room before night rolls in, because the event can catch you off guard.

What should I do when Rainbow Moon starts?

Move first, think later. Rainbow Seeds can appear around the map, and people usually notice them fast. Check open paths, corners near familiar landmarks, and places players tend to run past while chasing the obvious drops. It's not a long event, so standing still to sort your backpack is a rough choice. A clean inventory and a clear route make a real difference. If you're on a slower device, stay near an area you know well rather than trying to cross the entire map every time.

Is a packed server better for finding them?

Sometimes, but it comes with a catch. A busy server may feel livelier during Rainbow Moon, and players often report seeing more activity when lots of people are online. Still, every extra person is another pair of eyes on the same seed. Smaller servers can feel quieter and give you more breathing room, though the event may seem less exciting. There isn't one perfect choice. Try a few server sizes over several nights and see which one suits how you play. Some players like the rush; others would rather have space to search.

What happens after I plant a Rainbow Seed?

You're taking a roll on the crop result. A Rainbow Seed grows into a Seed Shop plant with the Rainbow effect, but you don't get to pick which plant comes up. That uncertainty is why many players save the seeds until they've cleared a good patch of land and handled their usual farm work. Protect anything you'd hate to lose before running off during the event, too. For players watching for GAG 2 Items for sale, Rainbow crops can be a tempting goal, but the best returns usually come from being ready when the moon changes.