Pinching back seedlings - how do you do it?

Northfield, MN(Zone 4a)

I started seeds for the first time this year - marigolds, impatiens, zinnias, snapdragons, petunias, sweet william, alyssum, straw flower and pansies. First, it was tough to get just a few seeds in each container, especially the snaps, so multiple plants sprouted in each little container. As they grew, I know I should have thinned them - but they were so tiny and delicate that I couldn't bring myself to do it for fear I would destroy them all. So I let them grow together. I have since transplanted them to interim containers until it's time to move them into their official summer residences (pots and window boxes). When I transplanted I thinned them a bit, and that did help most. But, some are still kinda leggy and weak, in particular the alyssum, tom thumb impatiens, zinnias and sweet william. So, should I pinch them back to try to sturdy them up a bit before putting them in the garden? And if so how do you do it? Just a couple of leaves off the top? the whole top? The pic was taken before I transplanted to interim containers. The alyssum is on the right, pansies and petunias in the middle, pansies to the left, and snaps in the round container in the back left corner.

Thumbnail by bmblsad
Vicksburg, MS(Zone 8a)

I don't raise much from seed but I've read on here that, to strengthen leggy plants, put a fan on low and let it blow on them. I'm assuming you would need to back the fan off a ways so your plants don't feel like they're in a hurricane. Also, I use very tiny scissors (some folks call them toenail scissors) and snip out all but the largest one or two plants in each pot so they have room to grow and less competition for water and nutrients. Hopefully some of our seed growers will come along with more complete advice than I have.

to pinch back just remove the apical bud - the little bud growing between the top most leaves. it will force the plant to send our branching stems.
it may also remove the flower bud on some plants.
I am not sure about the flowering part since I usually deal with perennials and don't care about the flowers if I'm trying to get a plant to thicken up (flowers will always come back in a year or 2 on perennials - I can wait).

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