✨ Drip lines humming, coffee in hand, hoses uncoiled — summer means business.
Deep watering Portland gardens is the single most important thing I'm doing this week, with a 94°F Monday already behind us and another 92°F day landing Friday. The forecast shows zero rain for seven straight days, which is normal for mid June here but always feels like a switch flipping from the wet spring. I'm walking the beds every morning with my coffee, checking soil moisture two knuckles down before I touch a single emitter.
This Week's Action List
- 1
Run drip lines between 5 and 8am for a long deep soak — established perennials and shrubs want roughly one inch of water per week, delivered in one or two sessions, not daily sprinkles. I time mine for 90 minutes on quarter gallon emitters to push moisture down 8 to 10 inches.
- 2
Check tomatoes every two to three days and water at soil level only. Inconsistent moisture during this kind of heat swing (94°F Monday, 75°F Tuesday, 92°F Friday) is exactly what triggers blossom end rot on Sungold, Brandywine, and the paste varieties. I mulch four inches deep with straw to buffer the swings.
- 3
Treat containers like patients in triage. A 12 inch terracotta pot in full Eastside sun will go bone dry in 24 hours once we hit the upper 80s — I finger test every pot daily and water until it runs out the bottom. Self watering reservoirs on tomato pots have saved me more than once.
- 4
Skip overhead sprinklers entirely this week. Wet foliage going into a 51°F overnight low (Wednesday) is an invitation for powdery mildew on squash and roses. Soaker hoses or drip only, and aim the water at the root zone.
- 5
Walk your hydrangeas and newly planted shrubs (anything in the ground less than two years) every other evening. They flag fast in this kind of dry heat — droopy leaves at 7pm mean they needed water at 6am. I give first year plantings a slow five gallon bucket soak at the base, then mulch the ring.
Frequently Asked Questions
How often should I water my Portland garden in June?
I water established beds deeply once or twice a week, aiming for one inch total, and check container plants daily. Tomatoes and other thirsty annuals get a deep soak every two to three days during heat spells like this week's 90°F plus days. Frequency matters less than depth — shallow daily watering trains roots to stay near the surface, which is the worst thing you can do heading into August.
What time of day is best to run drip irrigation in Portland?
Early morning, between 5 and 8am, is the sweet spot. Evaporation is minimal, the plants take up water before the afternoon heat stresses them, and foliage stays dry overnight, which keeps fungal diseases like powdery mildew and late blight in check. Evening watering in Portland's cool nights (we dropped to 51°F Wednesday) is a recipe for trouble.