Olive trees are not illegal across Arizona as a matter of state law. Individual cities and counties have passed ordinances restricting pollen-producing olive varieties because of their effects on respiratory health, and the specifics shift from one jurisdiction to the next. Plant the wrong cultivar in the wrong place and you can face fines or a forced removal; plant an approved fruitless variety and you may be fine.
The Public Health Reason Behind the Rules
The common European olive (Olea europaea) releases enormous quantities of wind-borne pollen each spring. Arizona’s dry climate and open landscapes let that pollen travel, and it worsens asthma and seasonal allergic rhinitis, both widespread in the state. The state has long drawn people seeking relief from respiratory problems, which is part of why local officials treat heavy-pollen trees as a public health issue rather than a landscaping preference.
Olives and mulberries show up together on nearly every local ban list. Pima County’s ordinance identifies plants that “produce large amounts of allergenic wind-borne pollens which are noxious and contribute to human disease,” with olives named among them.1American Legal Publishing. Pima County Code of Ordinances – 7.41.030 Mulberry Tree and Olive Tree Control
Pollen-Producing Varieties vs. Fruitless Cultivars
The bans target standard European olives and other heavy-pollen varieties. Cultivars bred to produce little or no pollen are often explicitly allowed. The two most commonly approved across Arizona jurisdictions are Swan Hill and Wilson Hill, both recognized as non-flowering and non-pollen-producing. Majestic Beauty, which rarely produces pollen or mature fruit, is another option carried by regional nurseries.
Tempe’s ordinance states that “olive or mulberry tree varieties or cultivars that are pollenless and fruitless such as ‘Swan Hill’ olive may be planted or replaced.”2City of Tempe. City of Tempe Code Violations – Trees Oro Valley also permits Swan Hill and Wilson Hill specifically because they do not produce pollen.3Town of Oro Valley. Addendum E Prohibited Plant List
Not every jurisdiction carves out the same exemption, though. Assuming fruitless varieties are allowed everywhere can put you in violation. Check the ordinance that covers your address before buying any olive tree.
How the Rules Vary by City and County
Because the restrictions are local, the scope changes from place to place. Some jurisdictions allow approved cultivars, and at least one bans olive trees outright.
Phoenix
Phoenix has prohibited the sale and planting of pollen-producing olive and mulberry trees since 1986 under Section 39 of the Neighborhood Preservation Ordinance.4City of Phoenix. Landscape Frequently Asked Questions Nonpollinating cultivars are permitted.
Pima County (Tucson Area)
Pima County’s ban took effect in January 1985 and reads broadly: no olive tree may be sold in the county, and no olive tree may be planted in the county. Both acts are declared a public nuisance.1American Legal Publishing. Pima County Code of Ordinances – 7.41.030 Mulberry Tree and Olive Tree Control The code does not include a visible exemption for fruitless cultivars, which makes Pima County’s rule one of the strictest in the state. If your property is in the Tucson metro area, confirm whether you fall under county or city rules before assuming any olive tree is allowed.
Tempe
Tempe prohibits planting or replacing pollen-producing olive trees but explicitly allows pollenless and fruitless cultivars such as Swan Hill.2City of Tempe. City of Tempe Code Violations – Trees
Mesa
Mesa treats planting a pollen-producing olive tree as a public nuisance and prohibits the sale or planting of any olive tree that is not a nonpollinating variety. The city keeps a public list of approved cultivars.
Smaller Cities and Towns
Apache Junction and Oro Valley follow the same pattern: standard European olives are prohibited while Swan Hill and Wilson Hill are specifically permitted.3Town of Oro Valley. Addendum E Prohibited Plant List Across the state, the targeting of pollen-producing olives is consistent, but the fine print varies enough that your municipal code is the only reliable guide.
What Happens to Trees That Were Already There
Most Arizona jurisdictions do not require property owners to remove olive trees that were already growing when a ban took effect. When Pima County’s rule began in 1985, existing trees were left alone. The bans generally reach new plantings and new sales, not established trees.
A grandfathered tree still comes with responsibilities. Some jurisdictions require property owners to manage pollen output, and a neighbor’s code complaint can prompt an inspection. If you inherit or buy a property with a mature pollen-producing olive, check whether your city imposes any maintenance or mitigation requirements.
Fines and Enforcement
These ordinances carry real penalties. In Phoenix, a violation of the Neighborhood Preservation Ordinance carries a fine of not less than $100 for a first offense, with higher penalties for repeat violations.5City of Phoenix. Phoenix City Code – 39-16 Violations and Penalties In Pima County, planting or selling an olive tree is a public nuisance that can trigger abatement proceedings.1American Legal Publishing. Pima County Code of Ordinances – 7.41.030 Mulberry Tree and Olive Tree Control
Enforcement can also include mandatory removal of the prohibited tree at the owner’s expense. Professional removal of a mature olive, including stump grinding and disposal, typically runs from several hundred to a few thousand dollars depending on size and access. That is a steep cost for what might have been a $50 nursery purchase.
Keeping or Replacing a Pollen-Producing Olive
If you want to keep an existing tree, chemical treatments can reduce its pollen output. Products containing naphthaleneacetic acid (NAA) or ethephon cause flowers to abort during bloom. The sprays have to be applied at mid-bloom and again at full bloom, cover the entire tree, and a single application is usually only partially effective.6University of California Agriculture and Natural Resources. Stop Olives from Bearing The timing is strict, which makes this an ongoing commitment rather than a one-time fix.
Replacing the tree with an approved fruitless variety is the more permanent fix. Swan Hill olives resemble standard European olives, grow well in Arizona’s climate, and will not trigger an ordinance violation in jurisdictions that permit them. Confirm your city or county recognizes the specific cultivar before you buy.
HOA Rules Can Add Another Layer
Even where local ordinances permit fruitless olives, a homeowners association may impose its own landscape restrictions. HOA covenants commonly include prohibited plant lists that go beyond municipal rules, and some ban all olive trees regardless of variety. These rules are enforced through your CC&Rs and can bring daily fines that accumulate quickly. Before planting, check both your local code and your HOA’s landscape guidelines. A tree that satisfies the city can still violate your association’s rules.