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i've had mixed results with rototilling.
the most recent round was last summer when i killed off an invasive plant species and then leveled a large area (to eliminate a gully that was forming).
the tilling did help break the soil up making raking and leveling a much easier task. it also provided a nice fluffy seedbed for the spiral design i planted (too fluffy, i should have firmed it up a bit before seeding it in).
8 months later... the seedlings have crowns 3-5cm above the soil. i'm not sure how the deer and bunnies will crop them, but i'm hoping not too low. and i'm also wondering how they will do if we get a cold snap without snow cover. if that will freeze-dry the crowns and force them to start over from below.
last winter we had good snow cover and i didn't lose much of anything. we'll see how the next winter goes.
the major negative from the tilling was the spread of a different invasive plant species seeds through the area. i now have about 20-30 more hours of hand weeding to get it out and then consistent weeding to keep it out (probably for a few years before it will be gone). luckily i've done this before for this species so i know it can be done. i won't resort to spraying again. most of the seedlings are still alive under the smothering growth, they just aren't going to perform as well as i'd like until i free them up.
the 9 hours of weeding i've already done is looking nice as the rains have perked the seedlings up. now a few more days of sunshine to dry things out so i can finish the rest. the plants need to get some more growth on to be self-shading before the hot and dryer period starts up.
the clay is about as compacted as it was before i tilled. tilling didn't accomplish much there. once the worms finished up all the rotted organic material from before i'm not seeing much activity, except in the pathway where i'm piling the weeds.
the next big project is to terrace the red patch, i'm turning it into a mixed garden. i won't till it because it has hundreds of perennials already that i want to leave in place as much as possible. i hope i can start that tomorrow or the next day. even if i can only get the top few levels done that would be a big help and a nice start.
i can't think of any other gardens i would have to till. the biggest garden i normally spade wouldn't do as well if i tilled. i need the larger clumps of soil to pile up for a long mound i make to plant the cosmos on. it being a low spot i use the trench to catch water and the mound to keep the cosmos high, dry and the roots happy. if it were tilled the soil would run down faster and the cosmos would fall over in the wind.
my other previous uses of tilling has been mostly to mix amendments. for larger areas now i've just mixed it by hoe in the wheelbarrow and then spread it out. for smaller already established gardens i don't do that any more. if something needs to be added, i put it in the mulch and the worms, rain and gravity do their thing to incorporate it. peaceful that way...
songbird