Tough question, What is the single most beneficial addition to your garden.
What brings the most benefits?
I think it's a collection of everything we do to get good and desired results. Maybe something stands out more than the other, but only when everything is added up is it
One of the future benefits that will definitely mean more to my son than to me is that we teach him about gardening through play.Even though plants sometimes suffer in that game, I don't regret it.
Of course, when it comes to the garden itself, fertilization is essential. Because regular cultivation of plants depletes the soil. And in order to have a satisfactory yield every year, fertilization is necessary.
Another useful addition that I bought is this faster soil tester. Although I know a few, let's say folk soil tests
In a cup of water you mix water with vinegar or soda, depending on whether you want to test whether the soil is acidic or basic. And in that cup you add soil from the garden and monitor the reaction.
But this tester shows much faster what the soil is like.

One of the indispensable accessories in the garden, at least in my case, is a drip irrigation system.
Although it is now December and the entire system is assembled and safely stored until spring.
Hoses, taps, branches, everything that makes up the system that means life for plants in the summer months.
One addition that I didn't even notice unless it was there is a rope
Yes, you heard right
Ours is a windy area so a rope with a few wooden stakes makes a good base for plants so that the wind doesn't knock them over or lay them down. Good for marking, labeling, attaching, securing plants, sometimes even fruit branches, whatever comes to mind that is useful.
Since it's becoming increasingly difficult for me to find natural twine on the market, I also use artificial twine. Just make sure to remove it from the garden after it has served its purpose. As for natural twine, it will decompose.

For those of us who have an orchard in addition to our garden, pruning shears, both small and large, are an indispensable accessory. Because without them, there is no good orchard.
A spray bottle is essential for both the garden and the orchard. They come in various sizes: 1 liter, 3 liters, 5,8,10 ... We all want everything to be organic, but we also have organic preparations for spraying, and we can make some ourselves
We have black soil, but the combination of wind and weather conditions makes the soil harden quickly, as if it is glued together.
To get rid of the crust on the soil that sticks, we have to hoe or , a motor cultivator or I have made a kind of stubble cutter that is suitable for breaking up the soil.( Spartac)

It deserved a little renovation this spring. Since I already sow in rows that are the same width. It is convenient for me to quickly and often go through the rows with it, cut the grass and break up the soil.

A small tool that I have had for as long as I can remember. I bought a new modern spiral that goes with a cordless drill. A spiral for drilling a hole in the ground, but I prefer this hand drill or whatever.

There's a lot more, and I say it all together gives the effect we want.
Thanks for reading.
Until next time.
Stay healthy.
Markone85

I really loved the part where you mentioned teaching your son through play. That is a beautiful gift he wi carry for life and it makes the garden even more meaningful.
I'd find it hard to choose as well! Definitely twine is handy and a Ph tester! Great answer as usual!
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