Olive farmers look for a rebound year
A big spring bloom, a ‘rebound’ after a poor crop — olive growers everywhere live with a rhythm most shoppers never notice: the olive tree’s deep tendency to a heavy year followed by a light one. It shapes prices, harvests and the whole trade.
When California growers cheer the biggest spring bloom in years and talk of a ‘rebound’, they are describing something every olive region knows in its bones. The olive tree does not crop evenly year on year. It swings — a heavy ‘on’ year followed by a light ‘off’ one — and that swing, called alternate or biennial bearing, is one of the defining facts of olive farming.
Why an olive tree swings
The mechanism is simple once you see it. In a heavy ‘on’ year, a tree pours its energy into ripening a huge crop — and all those developing seeds send out hormones that suppress next year’s flower buds. So a bumper harvest is followed by a lean one, and a light or frost-hit year, having formed few seeds, is often followed by a big bloom and a ‘rebound’. On top of this built-in cycle sits the weather: olives flower in spring, and a cold, wet, or windy bloom can wreck pollination and slash a crop regardless of the tree’s intentions.
California’s two olive industries
California is really two olive stories. The older is table olives — the canned black ‘California ripe’ olive, grown mainly in the Sacramento Valley around Corning and Oroville, using big Sevillano and Manzanilla fruit. The newer, booming one is olive oil: from the 1990s, growers planted modern, densely hedged oil groves — Arbequina, Arbosana, Koroneiki — across the San Joaquin Valley and the Coast Ranges, built for machine harvest and chasing the fresh, high-quality end of the market. Both live with the same bloom-time gamble.
What growers do about it — and what it means for you
Growers fight the swing with careful pruning and, for oil groves, timely irrigation, evening out the peaks and troughs so the tree crops more steadily. But they never abolish it. For a buyer, the takeaway is patience and perspective: a bad harvest headline is often just the ‘off’ half of a natural cycle, not a catastrophe, and it is usually followed by a rebound. It is also a good reason to value fresh, traceable, locally milled oil — a Californian oil pressed close to harvest is a very different thing from an anonymous bottle that has been sitting in the supply chain across a swing year or two.
| Factor | What it does | Result |
|---|---|---|
| ‘On’ (heavy) year | Big crop; seeds suppress next year’s buds | Followed by a light year |
| ‘Off’ (light) year | Small crop; few suppressing seeds | Often a big bloom and rebound next |
| Spring weather | Cold, wet or windy bloom harms pollination | Can slash a crop in any year |
| Pruning & irrigation | Growers even out the tree’s effort | Steadier, but never flat, yields |
What to take from it
- Olive trees show alternate bearing — a heavy year then a light one — so harvests naturally swing.
- A poor crop is often just the ‘off’ year; a ‘rebound’ usually follows.
- Spring bloom weather is the yearly wild card that can override the cycle.
- California runs two industries — canned table olives and a modern oil boom — both bloom-dependent.
Olive harvests and alternate bearing: common questions
What is alternate bearing?
The olive tree’s natural tendency to a heavy ‘on’ year followed by a light ‘off’ year. A big crop’s developing seeds suppress the next year’s flower buds, so yields swing.
Why do olive crops vary so much year to year?
Two reasons stack up: the built-in on/off cycle of alternate bearing, and spring weather — olives flower in spring, and a cold, wet or windy bloom can ruin pollination and cut the crop.
What is a ‘rebound’ year?
The big-bloom year that often follows a poor one. Having set few seeds in the light year, the tree suppresses fewer buds and can flower heavily the next spring.
What olives does California grow?
Both: canned ‘California ripe’ table olives (Sevillano, Manzanilla) mainly in the Sacramento Valley, and a modern olive-oil industry (Arbequina, Arbosana, Koroneiki) across the San Joaquin Valley and Coast Ranges.
Can growers stop the swing?
Not entirely. Careful pruning and, for oil groves, timely irrigation even out the peaks and troughs, but the tree’s tendency to alternate is never fully abolished.
Once you know about alternate bearing, olive-harvest news stops sounding so dramatic. A grim ‘crop down’ headline is very often just the ‘off’ half of a rhythm the tree has followed since before anyone farmed it : gorge one year, rest the next. That’s why growers talk about ‘rebound’ years with such confidence — a light, frost-hit season sets few seeds, so the tree comes back swinging with a big bloom. The weather at flowering is the wild card layered on top. For the rest of us, the lesson is perspective and freshness : don’t panic at a bad-harvest story, and prize oil that’s fresh and traceable to a place and a season, rather than an anonymous blend that has drifted through a swing year or two on its way to the shelf.
Drawn from olive horticulture (alternate/biennial bearing) and the structure of California’s table-olive and olive-oil industries.