Super Sweet 100

Sweet 100 tomatoes are especially prone to early blight and leaf spot, which show as brown spots with yellow halos on older leaves. Remove and discard infected leaves early, avoid wetting foliage when watering, and spray a labeled fungicide at the first spotting stage if the problem persists. Watch closely for tomato hornworms (large green/striped caterpillars) and hand-pick them at night, then check plants again the next morning.

Harvest when the grape-like fruits are fully colored (bright red) and feel firm but not hard, usually about 60 days from transplanting to harvest. Pick clusters often—every 2–3 days in warm weather—because Sweet 100 tomatoes ripen in waves and unpicked fruit can delay new set. If you can easily twist one fruit free without forcing the stem, it’s at peak eating ripeness.