Oleander Disease Resistance from Cuttings: Theory Has Merit

Southern California oleanders dying from disease (leaf scorch/Xylella?). Owner proposes propagating from healthy survivors for resistance.

Assessment

Theory has merit: survivors may have genetic resistance. But they could also be "escapes" (not yet infected). True resistance requires controlled testing.

Propagation & Watering

• Take cuttings from healthy plants; root in sterile mix.
• Irrigation: switch from night to early morning (4–8 AM) to reduce turf disease.
• Deep, infrequent watering for trees; use rain gauge.
• Fixed clogged sprinkler on English walnut—good catch.

Book Offer

Author of "Amateur Rocket Motor Construction" offered signed copy; expert declined politely.