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German roaches are the species that turns “I saw a roach” into “I have a problem.” A single female produces an egg case of 30-40 nymphs roughly every month, and the nymphs mature in as little as six weeks. That math is why one-off treatments fail: anything that doesn’t outlast the egg cycle just prunes the population.
Here is a 21-day plan built around that biology.
Days 0-2: Map before you treat
Put down sticky traps — under the sink, behind the fridge, beside the stove, in the bathroom vanity — before any product. Forty-eight hours of trap counts tells you where the harborages actually are, which is rarely where you saw the roach. (Full method: mapping a nest with sticky traps.) One rule from day zero: stop spraying. Repellent sprays scatter German roaches into new rooms and can make bait placements fail.
Days 1-3: Saturation placement
German roaches forage short distances, so treatment lives or dies on placement density. Working from your trap map, place sachets every 1-2 feet along the hot zones: cabinet hinge-lines and corners, under-sink pipe entries, the fridge compressor bay, behind and beside the stove, dishwasher kick-panel, bathroom plumbing gaps, and any wall crack near a heat source. A typical one-bedroom apartment’s kitchen and bathroom takes 30-40 placements — one full box. Under-placing is the number-one reason treatments stall.
Days 4-14: The die-off — and the nymph surge
Expect activity to drop within the first week, then a confusing bump: seeing small roaches around day 10-14 usually means egg cases laid before treatment are hatching, not that treatment failed. Nymphs stay close to harborage, which is exactly where your placements are — hold the line and keep kitchen sanitation tight (dry sink at night, sealed food, bins emptied) so placements are the best food source in the room. Progress signals to watch: fewer adults on traps, then fewer nymphs, in that order (more in Is your roach treatment working?).
Days 15-21: Refresh and verify
Replace sachets in the original hot zones — this refresh catches the hatched generation before it breeds, which is the entire difference between suppression and elimination. Re-run sticky traps for 48 hours at day 21. Zero or near-zero captures for a week: move to maintenance placements (a handful in permanent hot spots). Still catching adults: you have an untreated harborage or a neighbor problem — see our shared-wall containment guide.
When to escalate
If trap counts aren’t falling by week 3 in a multi-unit building, the infestation is probably building-wide, and no single-unit treatment — DIY or professional — fully solves that. Perimeter placements protect your unit while the building sorts itself out.
Plan your quantities honestly. A real German roach treatment is two full placement rounds plus a perimeter: for an apartment that’s the 3-box kit; for a house or a landlord treating multiple units, the 5-box kit. Buying one box for a real infestation is how people end up “treating” for six months.
What not to do during the 21 days
Three things quietly reset the clock. Don’t fog or spray “to speed things up” — repellents scatter the colony into bedrooms and wall voids your placements don’t cover, and can set a treatment back weeks. Don’t reorganize the kitchen mid-treatment: pulling every cabinet apart at day 10 disturbs harborages and moves roaches away from your placement map; save the deep reorganization for after day 21. And don’t ration placements to stretch a box — fifteen sachets doing the job of forty is the slow-failure mode where you kill foragers for months while the nest out-breeds you. Landlords and house-sharers, one extra note: German roaches travel through shared walls along pipe and cable runs, so coordinate timing with neighbors where you can. Even without cooperation, a properly dense unit treatment plus perimeter placements at the shared-wall penetrations keeps a treated unit defensible while the rest of the building catches up.
Treating an active infestation? One box treats one room, once. The 3-Box Kit — $120 (150 sachets, save $59.97) covers a full apartment through the complete 3-4 week treatment cycle; a $47 single box (50 sachets) covers a single-room problem. Ships within 1 business day, typical delivery 6-10 days · Free tracked shipping · 30-day money-back guarantee.
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