While not as common, underwatering can also be a cause of brown spots on your Monstera's leaves. Typically, these start on the edges of the leaf, turning them brown and crispy (this applies to all ...

Symptoms begin as small brown spots that can have a yellow halo around them, as spots coalesce the leaf may turn yellow (Figs 1 and 3). Infected leaves may drop prematurely (Fig 2). If symptoms remain ...