White Oak
- Hardiness
- 3-9
- Mature size
- 60-100 ft, wider than tall with age
- Growth rate
- Slow (but faster than its reputation)
- Bloom season
- April (catkins)
- Harvest season
- Acorns (sweet-type, leachable for flour; wildlife gold) in fall
Oak
Family Fagaceae
An oak is the most consequential thing you can plant — the tree your great-grandchildren will be photographed under. This entry covers two natives, white oak and northern red oak: centuries-long lifespans, serious shade, and acorns that run the backyard economy of jays, woodpeckers, and squirrels.
No native tree feeds more life — oaks host more caterpillar species than anything else in the woods, which is what actually feeds baby songbirds. Let horses and dogs skip the acorns; they're wildlife food, not fodder. Plant one now — the sooner it starts, the sooner it's ancient.
Full Sun
Low water
Native to North America
Which oak do you have?
Hardiness differs across the 2 oaks in this guide, so pick yours and this panel answers for that one.
Enter it once; every plant page remembers.
White Oak
- Mature size
- 60-100 ft, wider than tall with age
- Growth rate
- Slow (but faster than its reputation)
- Bloom season
- April (catkins)
- Harvest season
- Acorns (sweet-type, leachable for flour; wildlife gold) in fall
Oak · Common problems
Common oak problems
Pests, diseases and weather to keep an eye on.
Nothing common enough to list for oak. Watch it like anything else in the garden, and check the plants growing next to it.
Oak · Which one do you have?
The 2 types this guide covers
Where these differ, the key facts above give the span across all of them. Each type’s own figures, as the catalogue records them:
Northern Red Oak
- Hardiness
- 3-8
- Mature size
- 60-75 ft
- Growth rate
- Fast (for an oak — 2 ft/yr young)
- Bloom season
- Spring (catkins)
- Harvest season
- Acorns (bitter, need leaching for flour; wildlife gold) every 2-4 yrs
Oak · Growing & propagation
Growing oak
Light, water, soil, propagation and the season’s jobs.
What it needsThe details
- Light
- Full Sun
Fertilizer- None
How to plant & propagate oak
- Propagate
- Seed (stratify), cuttings, or layering
Oak · Calculators & field guides
A little help in the garden.
Calculators for the figures. Field guides for the hands-on work.
Oak · Yearly calendar
The oak year, month by month
What oak asks for, month by month.
No fixed season calendar for oak — its care follows conditions, not the calendar.
Oak · Ecology & uses
Ecology & uses
What it does for the garden, and what it is grown for.
Oak in the garden system
- Canopy layer tree
- Keystone: Keystone — hosts 900+ caterpillar species (the #1 woody host)
Moisture- Upland / dry
Deer- Browsed
Protect young plants
- Origin
- Native to North America
What oak is grown for
! Some parts toxic — see notesAcorns toxic to horses/dogs in quantity
Edibility, identification, and traditional-use notes here are general reference — not medical or veterinary advice, and not a claim that any plant treats or prevents anything. Medicinal ratings record how strongly a plant features in herbal tradition, nothing more. Never eat or dose a plant you have not positively identified. More on how to use this library.
Oak · Varieties & cultivars
Choosing a oak variety
Match the plant to your climate, season and available space.
Compare hardiness, mature size, growth habit, days to maturity and intended use in the seller’s variety description. Where this guide covers several plant types, start with the type you want to grow, then choose a variety for your season and space.
Sources & plant identity
Know what you’re growing.
See where the knowledge comes from.
Oak
The plant, at a glance.
- Plant family
- Fagaceae
- Growth habit
- Tree · Perennial
- Origin
- Native to North America
- Invasive risk
- Low
Every garden is different.
Hardiness, size and timing vary with your cultivar, soil and climate.
Rooted in research.
University extension research, brought together with hands-on growing experience at Story Thyme Farms.
Questions
Oak questions, answered straight.
Is oak safe for kids and pets?
With care. Acorns toxic to horses/dogs in quantity Site it accordingly if children or pets roam the garden. This is general reference, not medical or veterinary advice — call a vet or poison control if something has actually been eaten.
How do you propagate oak?
Seed (stratify), cuttings, or layering.
Elsewhere
Where oak sits in the library.
Maple
Tulip Poplar
Bald Cypress
Sweetgum