Sowing is the initiation or promotion of plant growth, whether accomplished by sowing, planting, watering or any other means.

1) Placing a seed on mud?

2) Planting a seed on a well used path?

3) Throwing remains of your apple core in the garden?

4) Washing hands over grass when having a picnic?

5) So how can you take off a sukkah roof when it's water logged and will get into the grass?

6) Covering a plant with a blanket to protect it from say the sunlight or cold

7) Plants, what's there status on Shabbos?

8) Flowers, what's there status on shabbos?

1) Placing a seed in mud is a problem as growth is possible.

2) Planting a seed on a well used path isn't a problem of sowing as the constant trampling will prevent the seeds from sprouting. Similarly fine to plant a seed in a dessert.

3) Must be careful of discarding fruits and vegetables outdoors as they could germinate in the ground.

4) Can't get water on grass as it promotes the growth. Just be careful not saying you can't drink outdoors.

5) It could be OK to take sukkah roof off even when you know the water will get onto the grass when either:

The grass is already water saturated so not adding anything.

Or if you open it over pavement even if it will then roll onto the grass.

A way out of this is to put a plastic tarp out before yom tov and that way when you lift the roof it will spill onto the tarp.

6) Can't cover a plant with a blanket as it's promoting its growth.

7) Indoor plants are looked same way as outdoor ones so we don't water indoor plants, nor do we proposely improve the light, air or temperature.

We can't put it on grass or even suspend it over grass as it as it's possible that in hakachik terms this assists in drawing extra nutrients from the soil.

8) Once a plant is detached it's no longer living so it's not muktza like a plant is. But we don't put into water if not done before shabbos.