by a script 

there is this very useful script (by @carpiediem) :

Memrise Preview & Auto-Grow Buttons

It will skip planting session even if you didn't create the course yourself

In the address bar

You can alo click "continue planting" on any level and change /grow/ to /auto_grow/ in the address bar. On firefox and chrome a box pops up asking if you want to stay on the page, click leave and it plants the words automatically.


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