Barbed Brier

Barbed Briers are zombie-modifying plants that make a zombie prickly when eaten.

Overview
When a zombie eats a Barbed Brier, it will grow spikes around its body. These spikes damage other zombies when they're close by. It deals damage at the same rate and intensity as an Endurian. This itself does not damage the zombie that ate the Barbed Brier.

If a zombie is somehow touching a Barbed Brier without eating it, they will be dealt damage. Eating the plant itself also damages the zombie, but only for 0.5 damage points.

Barbed Briers are only activated by being eaten. Otherwise, they do nothing. This also means that it does not affect zombies that do not eat it, such as Gargantuars or several zombies under their Jam.

Barbed Brier is based off of the flowers and thorns of the Pereskia grandifolia, also known as the rose cactus. Its name is a portmanteau of "barbed wire" and "brier."

Plant Food Ability
Using Plant Food on a Barbed Brier will cause it to thorn-ify every zombie on the board. It remains after doing so.

Strategies
Use it when there are multiple zombies on the same tile, such as when they enter the lawn, or when they're huddled up in front of a defensive plant. It is also recommended to use it on stronger zombies, as they can live long enough to damage zombies more.

Do not use it on a single zombie that is alone. This will be a waste of sun and recharge, since the barbed zombie won't be able to do anything. Also don't use it against non-eating zombies, as they will not be affected by Barbed Brier.