Science · Specimen Trees
Granny Smith Apple
Green-skinned, firm, sharply tart fruit useful for fresh and cooked preparations. Very late season; reliable maturity requires a long growing season. Tree size, anchorage and drought response depend strongly on the grafted rootstock; full sun, drainage, compatible pollination and annual crop management are essential.
Profile
- Fruit
- Green-skinned, firm, sharply tart fruit useful for fresh and cooked preparations.
- Harvest
- Very late season; reliable maturity requires a long growing season. Timing shifts with region and weather.
- Cultivar distinction
- Australian-origin cultivar; green skin persists at eating maturity.
- Pollination
- Plant a compatible cultivar with overlapping bloom; bees transfer pollen.
Water & soil targets
- Moisture (VWC)
- Site-calibrated; varies by soil and rootstock
- Salinity tolerance
- Sensitive to saline irrigation; rootstock affects response, but salt accumulation can reduce growth and fruit quality.
- Drought tolerance
- Limited to moderate; fruiting and dwarf-rootstock trees need reliable moisture.
Optimal root measurement depth
8–18 in
Most absorbing tree roots live in the upper 12–18 inches, out toward the drip line. Typical guidance; confirm with a soil probe on site.
Support the long growing season with soil-based irrigation; green fruit color is not a signal to keep watering late into cold weather. Wet the active root zone, keep the graft union and trunk base clear, and let drainage restore aeration between irrigations.
Problems to watch
- Failure to mature before autumn cold
- Codling moth or locally important fruit insects
- Fire blight, apple scab or cankers according to local pressure
Stress signs
- Persistent leaf wilting or marginal scorch
- Reduced shoot extension and undersized fruit
- Premature leaf or fruit drop
Where you'll find it
- Baking
- Tart fresh fruit
More specimen trees
General agronomic guidance and typical ranges; actual targets vary by site, soil, climate and season.