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Penstemon seedlings

in Plants
This is the first time I have tried growing from seed.They are now on three sets of leaves, looking strong,do I pinch out the tops or leave them alone? Thank you in advance for any advice.🌱🌱🌱
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Back to your seedlings, if they were mine, (and I do have some) I will keep potting on until I get a large plant, then will put them out. I still have plants in pots in the GH that I sowed year before last, this year they will go out in May and will flower this year.
So my advise on any seedlings, grow on until you have a plant the size of what you’d buy at the GC.
If I put them out later,will I get a leafy clump without flowers?
I ask this as the garden had nothing in it when we moved here in Oct.I need to fill in with something even if it's just a bit of greenery!
Having spent 13 years abroad,I am a bit gobsmacked by plant prices now,hence trying to do a lot of filling in with basics,like Lavender,Perennial geraniums,Heuchera,then putting annuals between,just so there's something cheerful to look at.
If you are growing them in the house, then I would pot them up until you get to a 9cm pot size and then put them still potted into a sheltered part of the garden until they are a bit bigger.
The problem with putting them into the garden when they are small is that they tend to get swamped by other plants. Keeping them in pots as long as possible so they are bigger, they will get away much better when they are then planted out.
My neighbour has some but he doesn't seem to do anything to them at all.