Native Plants: Honolulu vs Mililani Town
How do native plants rules compare between Honolulu, HI and Mililani Town, HI?
Honolulu and Mililani Town have similar restriction levels.
Honolulu, HI
Honolulu County
Honolulu County permits native Hawaiian species as landscape substitutions under LUO Sec. 21-4.70 but does not mandate native-only planting; voluntary guidance comes from the Board of Water Supply Xeriscape Program.
View full Honolulu rules →Mililani Town, HI
Honolulu County
Mililani Town landscaping may substitute native Hawaiian species under LUO Sec. 21-4.70; HOA guidelines may govern which are approved for front yards.
View full Mililani Town rules →Key Facts Comparison
| Fact | Honolulu | Mililani Town |
|---|---|---|
| Code section | LUO Sec. 21-4.70 | - |
| Native mandate | None | - |
| Substitution allowed | Yes for street trees | - |
| Voluntary program | BWS Xeriscape | - |
| Applies to | All Oahu zoning districts | - |
| Code | - | LUO Sec. 21-4.70 |
| Mandate | - | None, substitution allowed |
| Guidance | - | BWS Xeriscape Program |
| HOA layer | - | MTA architectural rules |
Highlighted rows indicate differences between cities.
Honolulu FAQ
Does Honolulu require native plants in new landscaping?
No. LUO Sec. 21-4.70 allows native species as substitutions but does not require them. Voluntary guidance from BWS and UH CTAHR supports native plant selection.
Can I replace a required street tree with a native species?
Yes. The Land Use Ordinance permits approved native Hawaiian species as landscape substitutions with acceptance from the Department of Planning and Permitting.
Mililani Town FAQ
Can I replace my Mililani front lawn with ilima?
Under ROH yes, but the Mililani Town Association may require maintained turf coverage. Submit an architectural application before converting front yards.
Are native plants drought-friendly in Mililani?
Yes. Central Oahu's dry periods favor natives like ilima and uki uki. BWS Xeriscape Program highlights species suited to Mililani's sun and soil.
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