Where Should Your Adenium, Plumeria, and Pachypodium Be Right Now? — Pacific Northwest Zone Guide
PACIFIC NORTHWEST (Zones 7b–9) OR, WA, Coastal BC
Where Should Your Adenium, Plumeria, and Pachypodium Be Right Now? — Pacific Northwest Zone Guide
Coastal Oregon and Washington growers (Zone 8b–9): Portland is showing overnight lows of 47–54°F this week with daytime highs topping out around 76–81°F —and a significant cool, rainy pattern moving in Monday and Tuesday with 70% precipitation chances. This is the core PNW problem: the calendar is in late May, but the heat accumulation simply is not there. Adenium and Plumeria are not reacting to the calendar — they are reacting to soil temperature and air heat. At 53°F nights, your Adenium root zone in a container may be sitting at 58–62°F even on a warm afternoon. That is marginal. Keep plants in the warmest indoor or greenhouse location you have. South-facing windows with supplemental lighting are still your best tool right now.
Inland Pacific Northwest growers in the Willamette Valley or Puget Sound
lowlands (Zone 8a): Your situation is similar to coastal growers. The warm weekend
(76–81°F) is useful — use it for outdoor hardening on Saturday and Sunday while the
window is open. But Monday’s forecast of 58°F highs and 70% rain is a reset. Bring
plants back in for the week and watch the pattern.
Higher elevation or inland Washington/Idaho border growers (Zone 7b): You are
still firmly in the indoor phase. Do not rush this. Your outdoor window for Adenium is
typically June at the earliest, and Plumeria may not see meaningful outdoor time until
July. Maximize supplemental lighting now and focus on root health going into the
outdoor season.
What You Should Be Seeing on Your Plants
Adenium: Under good supplemental lighting, your Adenium should be showing active
leaf growth by now. If plants have been sitting in low light all winter and are barely
moving, it is not too late — get them under proper grow lights immediately and raise
ambient temperature above 70°F during the day. Bud set in the PNW is almost entirely
dependent on accumulated heat units. You will likely see your first bloom flush in July or
August once outdoor conditions cooperate.
Plumeria: Plumeria in the PNW is a true commitment. Without consistent warmth and
light, leaf emergence will be slow. If yours has begun to show bud swell, you are on
track. Do not move Plumeria outside until nighttime lows are consistently in the low 60s
— which in much of the PNW may be late June. Supplemental heat in a greenhouse or
enclosed porch speeds this dramatically.
Pachypodium: More cold-tolerant than Plumeria, but still needing warmth to push
growth. If your Pachypodium is in a warm indoor spot and receiving good light, you
should be seeing some crown movement. Outdoors is still a few weeks away for most of
the region.
Your Next Actions
1. Use the warm weekend window (Sat 5/23) for outdoor hardening — a few hours of2. 3. 4. 5. direct sun is valuable.
Get plants potted into Desert Oasis Potting Media now if you have not. You want root systems established and healthy before outdoor heat arrives. Apply Spring Top Dress Media to containers staying in current pots — the growing season is beginning even if temperatures are lagging. Supplemental lighting remains non-negotiable through May and likely into June for most of the region. Begin planning your Summer Top Dress Media application for when outdoor temps stabilize — in the PNW, this is typically late June.
The PNW heat deficit makes media choice more important, not less. Desert Oasis Potting Media’s drainage characteristics mean roots stay healthy during the frequent cool, wet periods that typify PNW springs. Wet, cold roots in heavy media are the leading cause of Adenium loss in this region. Spring Top Dress applied now sets the nutrient baseline for the summer push.
Cheers,
Michael