Can I wiggle away from your tulips for a second? I'll come back to them.
Let's take, instead, a child learning to stand. It's a pretty massive and marvellous thing. I think you are asking whether a child would feel a sense of achievement about it if people didn't say "Oh my God! You can stand! Well done you!!!!". My answer is: yes, they would feel a sense of achievement because, at long last, they can reach a toy that they desperately want to reach.
But think about what happens next:
- They reach the toy. They turn to you with a huge grin and you grin back "you stood up and reached the toy!" they don't need to be told "well done!" it's all there in their grin and your responsive grin.
What's wrong with saying "well done for standing up!"? Well, it assumes that you know what the child was aiming at. This is a good example actually.
Child stands for the first time. Then child SITS BACK DOWN with the desired toy. NOW they turn to you with a look of pride. It wasn't the standing they were so pleased to achieve, it was the toy getting. "You got the toy!" you say, and it's all their in their grin and your responsive grin.
If your child stood for the first and you were busy saying "Well done you!" before they'd turned to you to celebrate, then it's you deciding what is worthy of congratulation and celebration, and that might be completely at odds with the thing the child was wanting to achieve themself. So you hijack their own sense of pride by congratulating them for THE WRONG THING!!!!
That's why I think the impetus for such a celebration has to come from the child to be most valuable.
Back to the tulips... but that doesn't mean that we should just leave our children to get on with whatever anti-social things they might want to do and then celebrate with them when they've ripped the heads off a bed of tulips. In the flower-ripping phase of a child's life, it's much better either for a parent to find a place where flower ripping is positively welcomed (no gardener is going to complain at you ripping heads off the daisies and dandelions in his lawn ) or else to suggest something to the child that they'd like to do MORE than they want to do the flower ripping. And of course it's accompanied by "those are precious. Let's leave them alone because they are not ours. Here's something better to do". Only more likely the words will be "precious! not ours! bread for the ducks!" or even just "hey! Ducks!!!" if it's a 2 year old
I'm thinking that yes, children do pick up social cues, and some of it is inexplicit and some of it is explicit, but none of it has to be a judgment of the child. "don't pick the flowers you 'orrible infant" is less constructive as someone learns to navigate the world than something like "those aren't ours... let's do X instead" or "those are precious.. let's do X instead"
and all of this with a weather eye out for the 2 year old who actually only wants to pick one flower and is competely determined about it and really, ffs, what does it matter if they do?