Hole preparation

I want to grow outdoor, but without pots. From planting outside to harvest I plan to go 4 months, maybe 4.5 months max. So dig a hole in the ground. But what then?

- Grow in a native soil? How fine should be particle size? Just turn it over with shovel? Or break it more fine?
- Or buy "lightmix" with perlite in garden store?
- Any additives or not? Coco, perlite maybe? Any other?

I have slow releasing pellets for NPK, so no need to go there every couple of days. If there will be enough rain I will not water. Otherwise I will go and water plants once per week. So as easy as it could be.

You may want to keep in mind, your plants will need water on their own schedule, not on one that is necessarily convenient to your schedule, especially while they are establishing a root system. Windy locations dry out quicker. Organic mulches are your friends.

Depending on the moisture holding capability of your soil, you might consider putting some rotted wood pieces or other organic matter that will absorb and slow release water. If you don't mind spending a bit, consider adding some pelletized water crystals, instead of the wood. Stay safe.

Felt pots? You don't need to bury them. It is actually counter intuitive.

Hole in the ground? 3x3x3 is plenty big. Fill it with 30% cleaned screened back fill and perlite, and the rest high grade composted manures and earthworm compost.

You can go with happy frog soils like ocean forrest, but they are expensive and not near hot enough. If you want kelp and other meals, you don't need much. One or two cut full per 3x3x3 hole or 100 gallon smart pot is plenty.

Direct burial? Do you have lots of gophers? You might want to line the hole with chicken wire.

How is the light in the area? at least 16+ hours of DIRECT light in summer time..are there any trees or buildings around?

Take a look at my grow in my signature. Lots of info there.

Thanks @Dmannn ! So 30% soil from the hole (how fine it should be?), some perlite and 50% manures? Isn't that too hot?

Any other opinion?

I suggest you just copy https://www.rollitup.org/t/ganga-girls-northern-grow.963369/

If you're going to use fish derived nutrients and you have hungry predatory critters in your locale, you might get "dig ups" .

Keeping the plants in the ground and not dug up and dried out can lead to better yields.

I use a lot of composts in my soil mixes. Manures are great, but make sure they are aged. If not trying to keep my plants small, I dig my holes at least 30-36" across, and about 18-24" deep. The quality of your native soil is dependent on how much soil mix you use. In my sandhill patches, I use more soil mix. In rich river bottoms, you can use less. Using the smelly organic ferts will get your stuff dug up. Maybe ad small amounts to your soil mix, but give the varmits a couple three weeks to root around in there before you put your plants in.

Lots of pests out there. Maybe talk to your local ag extension officer about what other gardeners in the area are dealing with. Here in NW Florida, it's deer, rabbit, termites, grasshoppers, bud worms, etc, etc, etc.