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I had mowed shortly before these shots were taken. Within two days of mowing, the flowers bolted & had gone to seed. Dandilions are one of the quintessential "weeds." A disturbance (i.e. mowing) will cause them to almost instantly go to seed, they produce numerous seeds that can sprout the same year if conditions are right, and if mowing occurs frequently, they will simply change form & rather than growing tall (like the ones in my bottom picture) will grow short (like the ones in the top picture). The only way to mow the flowerheads off about 1/2 of my yard would be to mow the lawn less than 1" & I prefer to have my grass as tall as possible, because that encourages deeper root growth, stronger plants, & requires less watering.
I would love to use the leaf mulch that you suggest, unfortunately, we don't have either of those trees growing nearby and I don't know of anybody who'd let me borrow their leaves. (That might explain why my mom's yard doesn't have too many dandilions - she had 2 maple trees in the front yard.) All I've got growing in my yard is Chinese Elm, another quintessential "weed." (I'm using "weed" because like Niss said "a weed is a plant that is growing out of place.")
Both my husband & I like to see the pretty yellow dandilion flowers scattered in our yard. Normally, I'm not one to use chemicals until there are no other options. I suppose if calcium is a problem, I could always spread limestone throughout my yard.... it binds to the calcium, making it less available (aka chelation). I guess I'll call the extension office & find out what they charge for soil tests....