How to plant Oak Tree from Acorn
There is something a little magical about growing a mighty oak from a single acorn you picked up off the ground. I do it most autumns, and it is one of the easiest and most rewarding seeds you can start at home. All you really need is a handful of fresh acorns, a pot, and a bit of patience. Here is exactly how I do it.
Collect fresh acorns in autumn
Gather mature acorns as they drop in the fall. The fresher the better, because acorns lose their viability fast once they dry out, so it is best to plant them soon after you collect them rather than leaving them in a dry drawer for weeks. Look for plump, brown acorns with no cracks or holes.
Remove the caps and do the float test
Twist off the little caps, then drop all your acorns into a bowl of water and give them a few minutes. The good, viable acorns sink, and the ones that float are usually hollow, dried out, or eaten by weevils. Scoop out and discard every floater, and keep the sinkers for planting.
Plant the acorns
Fill a pot that has drainage holes with soil or compost, and settle each acorn just under the surface with the top pointing up. Water well, until it runs out of the bottom, then come back after about fifteen minutes and mist the surface again with soft water so the top stays evenly damp.
Germinate them under a moisture tent
Cover the pot loosely with a clear plastic bag to hold in the humidity, and poke a few holes in it so air can still move and nothing gets mouldy. Set the pot somewhere warm and bright, and give the surface a daily spritz so it never dries out. In about 20 to 30 days you should see your first little shoots.
Caring for your oak seedlings
Once the seedlings are up, take the plastic off and let them get used to normal air. Keep them in bright light, water when the top of the soil feels dry, and let them grow on in the pot until they are strong enough to pot up individually or plant outside. Growing an oak is a slow, patient project, but that first sprout is worth the wait.
Oak from acorn at a glance
| Stage | What to do | Timing |
|---|---|---|
| Collect | Gather fresh, plump acorns | Autumn |
| Float test | Keep the sinkers, toss the floaters | Same day |
| Plant | Just under the soil, top up, draining pot | Same day |
| Germinate | Warm, bright, moist under a vented cover | 20 to 30 days |
| Grow on | Uncover, bright light, water as it dries | Ongoing |
Watch how I do it
Want to see the whole process from acorn to seedling? Here is the full video on my channel, and subscribing helps me make more plant guides like this one.
How long does an acorn take to germinate?
Usually about 20 to 30 days if you keep it warm, bright, and consistently moist. Some are quicker and a few take a little longer, so give the slow ones extra time before giving up on them.
Do you have to do the float test?
Not strictly, but it is worth the two minutes. Floating acorns are usually hollow or damaged and will not sprout, so the test saves you weeks of waiting on seeds that were never going to grow.
Should I plant the acorn on its side or with the top up?
I settle mine just under the soil with the top pointing up and they do fine. Acorns are forgiving, so one that goes in on its side will still find its way up.
Can I grow an oak from an acorn indoors?
Yes, starting them in a pot indoors or a sheltered spot works well for germination. Once your seedling is growing strongly it will eventually want a bigger pot or a spot outside, since an oak is a tree at heart.
This guide is part of my complete houseplant propagation guide, where I walk through every method in one place.
Written by Bojana
Plant lover, grower, and music maker behind Plant House & Garden, with 35+ years of hands-on houseplant experience. Read more about Bojana →
