The answer to 'why is my garden brown patches' is that brown patches in your garden are often caused by drought, disease, or pest infestations. Brown patches can indicate areas of your lawn or garden that are struggling due to lack of water, fungal infections, or insect damage.
Some common causes of brown patches include drought stress, dog urine, grub damage, fungal diseases like brown patch or dollar spot, and excessive thatch buildup. These issues can all lead to unsightly brown or bare spots in your lawn or garden beds.