chemtrailinhaler wrote:
Especially eager to hear if other herbs would be appropriate as ground covering to mitigate the wrong kinds of insects or to assist in rich soil development. Would be great if these herbs can be used for food or medicinal purposes, but the real goal here is to augment the soil, improve water retention (can get a little dry in the heat of summer), etc.
comfrey is a popular option to suppress grass and accumulate calcium and phosphorus. it's good medicine, too, and bugs like it. nettles, dandelions, and alfalfa are also popular accumulators of various useful elements. lupines fix nitrogen, bear insectary flowers, look nice, and produce food. borage is good medicine and food and it's insectary. valerian is medicine and insect food. the Umbelliferae family (including the dill you mentioned) is great for insects and includes quite a few food and medicine plants. but none of those are really ground covers.
most of the culinary herbs are good for friendly bugs. the thymes are perennial creeping ground covers. there are some low lavenders that are real nice. oregano.
a lot of annual vegetables that tend to be a little bit poo pooed by permaculturists can be great for insects if they're allowed to flower. brassicas, carrots, lettuce, cilantro, fennel, &c. letting some flower can also lead to them naturalizing in your garden so you don't have to plant them again every year. which is nice.
some of my favorite ground covers are strawberries. garden strawberries (
Fragaria x
ananassa) are likely the easiest to find, but the fruit is mushy and bland, they wear out quickly, and they don't make a thick cover. beach strawberry (
F. chiloensis) and Virginia strawberry (
F. virginiana) cover much more completely, spread quickly, and have tasty fruit, but aren't typically very productive. alpine strawberries (
F. vesca) are delicious, productive, and live a long time, but most varieties spread only by seed, so they'll take a bit longer to fill in unless you can forgo eating them in favor of letting the berries fall to propagate. musk strawberries (
F. moschata) probably taste the best and they spread quickly and thickly. they're June bearing, though, which is frustrating. if you're the sort of person to get excited about these things, strawberry polyploidy is interesting.
as far as water retention goes, the apple trees should help with that, as will most plants with relatively deep roots. they'll have access to correspondingly deep water. as you build up the biological community that duane mentioned in your dirt, some of that water will be shared through fungal interactions with other plants that don't have the same deep roots. ground covers and mulch will keep things moist. incorporating organic matter into the dirt will help hang onto moisture. if you get around to building those swales, they will certainly help. digging pits and filling them with organic debris can capture some water that would otherwise run off your property.
getting carried away now, so I'll leave it at that. have fun.