So you are hatching them with a broody. That information helps. Are you going to let the broody hen raise them with the flock? I’ll assume you will.
I don’t know the quality of forage in your garden but it sounds like it could be pretty good. If the quality of forage is good Momma could raise them on that alone. That’s how broody hens have been raising chicks since there were broody hens. I’d still supplement their feed though.
I don’t know what you are feeding your hens, but the growing chicks should not eat Layer feed. The excess calcium can possibly damage them. If you are feeding the other hens Layer the chicks will get to it. I suggest you feed them all the same feed and offer oyster shell on the side for the hens that need the excess calcium for the egg shells. The ones that need it should eat enough for the egg shells, the ones that don’t need it shouldn’t eat enough to harm themselves. If they are foraging for the majority of their feed this isn’t that big of an issue but I still consider it good practice to not feed them something that could harm them.
I don’t care if you treat the feed, add supplements, go organic or regular, all that is up to you. I’d have a feeder with the feed where they can get to it, then leave everything else up to Momma. My broody hens normally take their chicks to a feeder first thing when I let them out in the morning, then spend the rest of the day foraging for food for them out in the grass and weeds. They get grit from the ground and by foraging where the other chickens have pooped they get any probiotics the adults have and start working on flock immunities and strengthening their immune systems. To me that is the best way to raise healthy chicks (strong immune systems) and it is about as natural as you can get.
To provide water where the chicks can get to it, I use white pet bowls in the shade in summer and black rubber bowls in the sun in winter. Until the chicks get big enough to be safe I fill them with clean rocks so the chicks can walk on the water instead of getting in and drowning. Clean water is essential for healthy chicks. Totally dump it out at least every two days, don’t just keep refilling it. That breaks up the life cycle of the pathogens that cause coccidiosis and keeps mosquito larva from developing into adult mosquitoes.
Good luck on the hatch.
