This is great advice if you're just starting out. There's a bit of an art to starting from seed.
You need to understand the dynamics like light, temperature, moisture, and seasonal timing. Where I live, you can start tomatoes indoors around February to have great starts that'll go into a greenhouse in March, or into the soil outside in June. That's quite an undertaking to time and get right. This year I got the timing, lighting, temperature, and all the rest right - the plants look amazing - but I have eighteen extra plants taking up a lot of space that I guess I'll just leave on the sidewalk for a lucky gardener in my neighbourhood. I could have used that space in the nursery for so many other useful things, but I had no idea what would survive or if some would be too small or whatever.
Each plant demands its own special conditions, and it takes a lot of space if you start indoors. Unexpected harsh conditions can suddenly ruin outdoor plants. Forgetting to water one day could more or less stunt an entire bed of seedlings. They can be so delicate, and it can really suck the fun out of gardening.
There's no harm in starting out in easy-mode.
I find seeds so cheap to buy, that I just buy a bunch of different packets (for a season), put em in a bowl, then just throw them everywhere in my garden. Then just rely on luck to see what I get.
When working with new garden beds, it let's me quickly find what seems to like that area of the garden. (I think the Japanese have some similar technique)
I'm a really lazy gardener though, my yields could be better but I don't want to put any work in aha
It's awesome for growing lettuces and herbs, I find - I just thin them out as they peak out of the straw and let the biggest ones stay, while the smaller ones get eaten as I thin them or make it into a salad or something for dinner.
But you're absolutely right, not worrying too much and just letting your garden do its thing is great. You might not get maximum yields of tomatoes or watermelons or whatever, but it can work well and take a lot of the fussing out of the equation.
It really depends. Some plants grow stupidly easy from seeds. A good example is tomatoes. You don't even need to buy seeds. Just go to a store that sells high quality produce, buy the best tomatoes you find (and taste them to make sure they're good), cut them open and and take their seeds. Boom, now you have several plants that grow amazing tomatoes.
1. Mulch mulch mulch! It keeps weeds down and water in and will add organic matter to your soil as it breaks down. Your municipality probably makes tons of mulch from trimming trees and you can usually find somewhere to buy a truckload from them for a few dollars. We put down at least 3 pickup truck loads over the course of the first year in ~200 square feet of beds. Unless you are directly sowing seeds somewhere, you don't ever want bare soil showing.
2. If you have plants that seem diseased or have pests, rip them out or prune the affected parts off ASAP. We don't use pesticides or anything so the best way to keep pest populations down is to keep them from multiplying. Caterpillars become moths/butterflies that make many more caterpillars. If you eliminate the plant or leaves hosting them, they won't get that far.
3. The more you weed, the less you have to weed. This is the same idea as with pests. These things don't spontaneously generate, so every weed you pull up that doesn't go to seed first is one less seed in your soil waiting to pop up. If you keep on it, eventually the only weeds you have to worry about are ones that come over from your neighbor's overgrown beds!
Low maintenance, hard to kill and great caloric yield.
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I guess you implied "at your home", but I do love the idea of guerilla gardening. Never done it with produce though, just flowers and trees.
Next I'm going to try some more traditional varieties that should be better for hobbyists.
Pick something easy – when I started with zero knowledge I tried some of the harder plants like asparagus and celery and managed to get nothing, but I stuck with it after I realized I couldn't kill my Swiss chard or lettuce or collards if I tried. And don't start off trying to grow from seed. Get starts from a plant store - more expensive, but less likely to die off.
Many of those easier plants are also amenable to growing in a five gallon pot, which is perfect for when you don't have a ton of space to work with, or if you just want to dip your toe in.