Penny's Pursuit day 2, probably the easiest to grind for 30%zps 🌶🌶🌶
Using bass boost perk.
You will have to buy plantfood for iceberg lettuce, unfortunately his freezing effect doesn't last long at level 1, there are some available for killing zombies and you do have a few thyme warps as well.
Place the plants as shown for maximum coverage and put your first iceberg lettuce somewhere safe.
Keep on planting spikeweeds on column 8 so witch hazel doesn't create more puffshrooms and dig up any puffshrooms that are in danger of pushing your protected plants backwards.
Just keep on freezing every new wave, let them get pushed back and let witch hazel zap them into nothingness.