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The safest method to avoid killing your turf grass is hand pulling Johnsongrass. You can also apply vinegar for a safer herbicide, but it will still burn your lawn if it gets on it.

Weeds can grow through rubber mulch, but it depends on if you removed all the weeds in your garden beforehand. Weeds already in the soil can grow even when using rubber mulch. However, that doesn’t mean that your garden will be littered with rubber and weeds, but it does mean that the occasional weed might still pop up. Another way you can increase your weed suppression is by using landscape fabric as a second layer. 

Herbicide application, manual removal, and landscape fabric are common approaches.

It’s best to pull weeds when the soil is wet, as it’s much easier. Wet soil is much softer than dry soil, making it easier to pull the entire weed up by the root. Also, since the soil is wet, the roots will let go of the soil and slide up with less resistance. Be careful when working on your wet garden, though, as wet soil is easier to compact, which can harm your plants.