I'm going to go against the grain here too as I'm not sure you're painting the full picture. You haven't really explained his side apart from the daffodils.
We all know people who like to jump on the latest trend or bandwagon they've seen on social media, or who get a buzz out of starting a new project or lifestyle (especially if they can show off to their friends on FB) and then the novelty wears off a bit later when it's proved to be too much like hard work. It must be awful being the partner of someone like that if you work hard all week, just want to chill at the weekend and your other half is nagging you to help them with this that or the other latest project or idea.
Sounds like you want to plant daffodils under the lawn. If maintaining the lawn his job then I'm with him I'm afraid. If it's your job, and you do all the mowing, weeding, reseeding then go for it but don't be involving him in any of it if it involves more work for him just because YOU fancy it because you saw Monty do it.
Chickens: make a mess/haven't got room/perhaps he's done more research than you and knows more about the issues with owning them & he thinks the novelty will wear off and he'll be left dealing with them? (I've no idea whether this is the dynamic at play here, but it might explain his seemingly "controlling" attitude).
Trampoline: Short-lived pleasure, novelty wears off for many kids. You're left with this huge thing in the way in the garden that people hardly ever use and it's a big faff to get rid of. Adds to the massive problem of non-biodegradable STUFF on the planet.
Tent: Is he into camping? Does he get dragged a long on camping trips under sufferance while he does all the difficult jobs while you sit there playing with the kids or sunbathing with a gin and tonic and instagramming your perfect family outdoorsy life? Do you have plenty of storage for the tent and all the other paraphernalia or is stuff falling out of wardrobes etc.
Digital photo frame: not sure why he's saying he doesn't want this, unless it's going to be huge, or you're not great with technology so will expect him to set it all up and download all the photos onto it etc.
I'm not saying any of that is what the situation is. But it COULD be, at least to some extent, and could be the reason why he appears to say no to everything. We don't know if he pays for all the bills while you spend all your money on these relative frivolities. We don't know if you're just blasting through your inheritance on things which he feels are shortlived pleasures whereas he thought you might have put some aside for your children's future etc etc.
Can I just make it clear, again, before anyone jumps in and says the usual "oh you're really projecting/making assumptions/reading so much into it that isn't there" - I DON'T KNOW IF ANY OF THIS IS THE CASE. But I do know that people are very quick to jump on one partner, usually the man, and say how controlling they are, without knowing the full picture from both sides.