I have a half plot and a full size plot fortunately on the same site but at either ends so time-wise can still be problematic deciding which needs priority when some things clash - for example, I need to be on one plot to harvest or on the other to plant out etc. I've been working the half plot some time and have permanent raised beds which helps a lot, the full size plot still work in progress as the soil needs a lot doing to it which is one of the reasons why I've kept the half plot for the moment
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. Raised beds mean I can deal with individual beds as needed, and footpaths are fitted with weed suppressant materials so that reduces how much time I need to deal with "non gardening" issues. The full size plot is still work in progress for several reasons (location, soil needs serious improvement, rampant marestail, risk of flooding in winter so going for raised beds again which I need to collect material, construct and it all takes time, etc)
I decided to use the half plot for what I call "basics" - potatoes, onions, leeks, brassicas and root veg as these tend to get planted/sowed earlier or later in the year or (generally) have a longer growing season. I also have an established asparagus bed which I harvest in spring/early summer. I use the full size plot mainly for summer cropping fruit and veg and anything with a short season (fruit bushes such as currants, blueberries, gooseberries as well as tomatoes, peppers, sweetcorn, beans, peas, squash, courgettes, salad stuff etc) - apart from the fruit bushes and strawberries, most of the summer crops don't get planted out until after the frosts in late May which allows me to spend the early part of the year on the half plot preparing the beds for sowing and planting and getting on top of the weeds as they come up so that later on it just needs minimal maintenance and batch harvesting while I spend most of the summer growing season on the big plot with occassional visits to the half plot to keep an eye out, pick out the odd weeds I might have missed, harvest and plant out new crops. I tend to grow overwintering crops (brassicas, garlic, overwintering onions, broad beans) on the half plot too but that's more to do with the possible flooding issues on the big plot.
In late autumn/winter weather permitting, I divide my time equally on both plots digging over and also removing perennial weeds such as marestail, bramble & bindweed, and digging in manure etc and creating raised beds. So although time-wise and stress levels do admittedly peak by mid-late June, generally I spread the workload throughout the year otherwise I don't think it would be possible to cope with both plots. As the big plot had not been cultivated in years (before waiting lists, it was not that desirable because of its location so had become a wilderness), I used weed suppressant materials a lot and planted stuff through it such as the squash - black plastic/material warm up the soil so is also beneficial for summer crops, and mulching also helps to retain moisture in the soil during dry periods. As time goes on, these are gradually being removed as the soil and beds improve.
Apart from keeping on top of weeds, the weather can play a big part too - this year's cold spring meant delaying the sowing/planting out on the half plot which has had a knock on effect on how much time I could spend on the big plot before planting stuff out. Though not as bad as some parts of the country, not enough rain has meant having to visit both plots regularly to water the crops. The torrential rains we'd had about a month ago had encouraged a lot more weeds to unexpectedly germinate and grow on both plots which needed attention. The recent heatwave has meant some fruit & veg have matured or ripened earlier than expected so once again my "plans" have had to change to deal with those. And don't forget the pests & diseases that can create havoc in your absence .... what I'm trying to say is that you'll need to be flexible with your time and allow for things to "go wrong" and deal with them! When it comes to growing your own, I don't presume anything to be "low mainteance".
I think the most important thing is organisation and planning - soil preparation (does it need liming or manure), what to grow and where, when to sow/plant out, when to harvest. I grow my own to be self sufficient so I grow a lot of stuff in batches which either go for long term storage (eg potatoes, winter squash, garlic, onions, shallots etc) or for freezing/drying/preserving for year round eating as well as fresh fruit & veg for the table. Which brings up another point - putting time aside to deal with the harvesting and preserving. Sometimes it can feel like a full time job but well worth it in my opinion.
Although I feel as though I've painted a daunting picture, I really wanted to let you know that it can be done so long as you are aware what you are getting yourself in to. I know your original question was "what is low maintenance" but I've found seasonal as described above seems to be the way to go
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