Eugene, my yard isn't all that huge (a little over a third of an acre) and 90 minutes on a riding mower would cut it no problem. The hard work is the edging because there is about 1,000 feet of walks, drives and gardens. Like many homeowners in South Florida we have St. Augustine grass for our lawns. That's Buffalo Grass to my Down Under friends. It sends out really tough runners so your sidewalk becomes a lawn pretty quick if you don't use a powered edger. The grass also covers the sprinkler heads so you need a good line trimmer to keep those working. Everything in South Florida grows fast so some weeks ther's 200-feet of hedges to trip. The next job is raking the cuttings (or a second pass over the lawn with the mower). Finish with a leaf blower to clear the bales of clippings and leaves off the patios, walks and drives. When it's in the 90s in the shade and who knows how hot in the sun, that's most of a day's work.My yard is small enough that I can manage to do most of the yardwork in about 90 minutes. It really depends on how long I let the yard go between mows. Your yard always appears pretty meticulous so you're doing well between crew visits.
I thought the big box hardware stores had free delivery for orders over a certain amount. Check to see if you can save the PT some wear and tear.
I believe RoundUp needs to be applied to leaves to be effective. I haven't researched the mechanisms it uses to kill the plant, but you might try using some other homemade mixture until you can get your hands on the Tordon RTU. I have a bottle in my cart so it doesn't appear to be restricted in the Garden State. The RoundUp wasbeffecive for me in trying to eliminate a bunch of vines that were also trying to suffocate my flowering bushes and roses.
Supplyhouse.com has some great pricing for plumbing parts for your future projects. They easily saved me 20% on all parts across the board.
It is unfortunate, but plants that generate tons of seeds like my Tree of Heaven are not conducive to a easy landscape. Your blooms are marvelously eyecatching.
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I had a pallet of squares delivered a few years ago and it was $80. It's a 10-mile round trip so 30 miles at 15-miles per gallon means about $7 in gas to collect 72 more concrete squares.
You're right about Roundup and I've tried it on the leaves of those seedlings with no results. I bought a quart of Southern Ag Brush Killer (Contains 8.8% Triclopyr) and will give that a try.
I have used https://www.supplyhouse.com/ for copper fittings several times. They carry a huge selection of fittings, including some I can't find locally. I was making up some air lines and didn't want a hard 90-degree elbow. Supply House had these Long Turn Elbows that were just what I was looking for.
For my PVC pipe fittings, I found PVC Fittings Online (https://www.pvcfittingsonline.com/) had a better selection and better prices. That PVC Union cost $8.75 at the Supply House, $7.42 at PVC Fittings Online and $6.16 at Home Depot. Those 1-1/4" Schedule 80 Close ******* were $1.53 at Supply House and $0.88 from PVC Fittings Online.
The downside of Home Depot is the dirt-bags who shoplift there. I bought two Unions just in case, One had FPT (Female Pipe Thread) inlet and outlet and the other had glue socket inlet and outlet. I neglected to take them apart or inspect them closely at the store. One had a cracked tightening ring and one was missing the o-ring so they were useless. I neglected to notice if both failed parts were on the same fitting but I ended up with the FPT with good tightening ring and o-ring and Home Depot now has a completely useless glue socket union (that will probably go back on the shelf).
The up-side of our relatively seasonless weather is the endless blooming of something. Our orchids like to bloom in the "Winter" months and our bromeliads bloom whenever they feel like it. Several trees go into bloom in the "Spring" months and all kinds of stuff blooms when it feels like it.




I don't ever miss looking in on your antics, and defense mechanisms. 
lights in the front garden off.
