Why does this homemade herbal tea always boil over?

Why does this homemade herbal tea always boil over? - Selective Focus Photo Of Jar Filled With Spices

I make my own herbal tea with: ginger, turmeric, black pepper, cloves, cinnamon sticks, goji berry, cilantro/parsley, and lemon. I boil the whole in water but for whatever reason I need to be around all the time to avoid a spill-over. It is like having an eye on milk on the fire. Is there any reason why it always spills over?

tea boiling

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Why does this homemade herbal tea always boil over? - High angle of crop female smelling aromatic freshly brewed tea in ceramic cup

Why does this homemade herbal tea always boil over? - Glass cup of healthy herbal tea served on wooden table near fresh gentle Arabian jasmine flowers on sunny day on terrace

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Master Recipe for How to Make Medicinal Herb Tea

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