Why exclusion comes first
Chance: pests get in whenever a path exists, no matter the grow method.
Scale: a small outbreak is far easier to stop than a large one.
Common indoor threats: aphids, fungus gnats, mealybugs, spider mites, thrips, and whiteflies.
Goal: recognize the pest and the damage, then block entry and cut numbers early.
Entry routes
Pets
fur carries insects and also sticks to resinous buds, so keep animals out of the room
Clothing
outdoor clothes can bring in a single insect that starts a colony; change into clean laundry first
Air
filter incoming air and seal cracks, holes, and other openings
Media
use inert or pasteurized mix so eggs and pathogens are not already in the pot
Quarantine new plants
Hold
keep any incoming plant out of a clean garden until it has been isolated
Treat
Rosenthal suggests a pesticide or fungicide spray or dip before it joins the room
Mothers
mite problems on a mother plant pass to clones, so scout that room first
One vector
even a single pest can seed a fast indoor outbreak
Scout before numbers explode
Frequency
check plants at least twice a week during fast growth
Where
look under leaves, along the upwind edge of the garden, and at the soil line
Curl
once leaves cup and hide insects, sprays and predators have a harder time reaching them
Takeaway
prevention and early action beat late cleanup