The Creator of the world never "neglects, is all-knowing and invincible". When one reviews this over in his mind he can face any challenge in life as he knows it is H'shem who is guiding and protecting him through it all.
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7 Children Playing in the Yard
Holes may not be dug in preparation for planting. But, there is no issue with children digging holes or smoothing dirt as part of their play. The fact that children are playing is a sufficient demonstration that playing, and not gardening, is what is on their minds.
Similarly, children may play with hoses and sprinklers during Shemittah, as usual, without concern that the ground is being made softer and easier to plant (in violation of the melachah of plowing), or the grass or other plants that are there are benefitting from the water (in violation of the melachah of helping crops grow). The fact that children are having a water fight or the like is itself a demonstration that planting or caring for plants is not on their minds.
Note: This is provided that the parents, or other people who own the yard, are truly not interested in the ancillary benefit of their lawn or plants being watered.
Planting
Planting is one of the Torah melachos forbidden during Shemittah. This prohibition includes planting both seeds and saplings, as well as grafting a new branch onto an existing tree or stump.
There is no difference whether the plant is one that will grow food, or is only meant for ornamental purposes, for example, flowers; they may not be planted during Shemittah. An even fully grown plant or tree may not be uprooted from one area and replanted in another.
The Sages ordained that a tree planted during Shemittah must be uprooted. The same applies to other plants as well.
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