Pacific Northwest (Zones 7b–9)

OR · WA · Coastal BC

Pacific Northwest growers in early June are dealing with the opposite of Gulf Coast growers. Your challenge is not heat-driven disease acceleration — it is the cool, overcast conditions that keep media wet too long and suppress the root activity that would otherwise allow plants to recover from stress.

The disease-alert framing of this article is less urgent for most PNW growers in the first week of June than for other regions. Your fungal disease pressure is lower because your temperatures are lower. Your primary concern this week is almost certainly cold-wet root stress presenting as yellowing and slow growth — not active fungal disease. But the exceptions matter, and they are worth watching.

Coastal Oregon and Washington (Zone 8b–9): Portland, Eugene, Seattle, Olympia

Your Adenium and Pachypodium are almost certainly still growing slowly if they are outside. Night temperatures in the mid-50s are still common in coastal areas through early June. If your media is not draining fast, the cool wet combination is building root stress that will surface as yellowing within two to three weeks.

Action this week: press-test every Adenium and Pachypodium caudex. If you find softness, the cause is almost certainly cold-wet root stress rather than a warm-environment fungal pathogen. Same intervention protocol — unpot, dry, repot into dry Desert Oasis Potting Media — but recovery is slower in your climate because your warm growing season is compressed.

Plumeria in coastal PNW are best kept indoors or in a heated greenhouse through at least mid-June. If yours are outside and experienced any rain or heavy marine layer this past week, inspect tips for bacterial rot. Cool wet conditions after outdoor placement are the trigger in your zone.

Inland PNW — Willamette Valley, Puget Sound Lowlands (Zone 8a)

Inland Zone 8a growers may be getting the first real heat of the season this week if a high-pressure ridge is in place. Watch for the thermal shock pattern on Adenium: sudden leaf drop when temperatures spike 15 to 20 degrees above the recent baseline. Caudex remains firm — this is stress response, not disease.

If rain followed your last heat event, check Adenium leaf surfaces for anthracnose. The wet-after-heat pattern in inland PNW creates brief but real fungal pressure windows. A single copper fungicide application as a preventative after significant rain events costs almost nothing and prevents the anthracnose from establishing.

Zone 7b Inland Washington / Idaho Border

Apply Cold Climate Zone 6 protocols in full. Your disease risk profile matches cold climate more than Pacific Coast. Caudex press test, morning watering only, tip rot inspection on Plumeria, copper fungicide after rain events. The compressed outdoor season in your zone means every week of healthy growth matters.

What We're Growing With — Pacific Northwest

Desert Oasis Potting Media — Non-negotiable for PNW growers. The fast drainage cycle in cool temperatures is the only reliable way to prevent the cold-wet root stress that is your primary early-season threat.

Desert Oasis Spring Jump Start — Most PNW growers are still in the early growth phase in June. Spring Jump Start is fully relevant for the next several weeks.

Desert Oasis Summer Top Dress Media — Hold for your first sustained warm stretch — late June in the Willamette Valley, later for coastal growers. Applying summer media before consistent warmth arrives works against you in your climate.

Full product details: americanadenium.com/pages/desert-oasis-products

Cheers, 

Michael