washing machine discharge water...need help

A garden hose will present problems. Best to plumb it to the collection tank with PVC (same as drains use) or a large diameter hose. If you put restrictions in the line, you will have a backup in the machine. Once collected, you can use a smaller hose to take it to the next step.

Be aware that there are going to be a lot of contaminants in the water so check that it is safe for your intended use.

I would pump the washer into another container, maybe a large garbage can maybe. Then, use another pump to pump it outside through a garden hose or pvc pipe. Keep in mind, though, that fine holes in any sprinkler head may get clogged by anything in the water, including lint. Some sprinkler heads that attach to a hose have a wide opening that will work better.

i would use a cheap sump pump for watering, less work than pail by pail. surround pump door screen to prevent clogging.

many detergents act as fertilizers, you may be trimming more

As you mention, long ago, I used to pump into into a heavy duty wheeled garbage container and then wheel out to where I needed it.

Shrubs love chlorine too, right?

On some machines the outlet of the drain hose must be above the top of the tub or the water can possibly be siphoned out of the tub during the wash cycle. Mine drains into a 2" pvc pipe which runs under the house to the front yard where it is hooked to black poly pipe. Besides not wanting to waste the water, I am on a septic tank. The yard seems to like it just fine, though I will admit I seldom use bleach.