How to Build a Dinosaur Garden with Prehistoric Plants

Mar 4

Here is a fact that blows kids' minds: some of the plants growing in your California garden today are essentially identical to plants that grew when dinosaurs walked the earth. Ferns, cycads, ginkgo trees, horsetails, and certain conifers have survived virtually unchanged for 100 to 300 million years. They are living fossils, and you can grow them in your backyard.

A dinosaur garden takes this concept and turns it into a hands-on project. You plant real prehistoric species, add toy dinosaurs (or build them from rocks and clay), create a Jurassic landscape in miniature, and use the whole thing as a springboard for learning about paleontology, evolution, and deep time. It is the perfect project for dinosaur-obsessed kids ages 4 through 12.

California is an excellent place for a dinosaur garden because our mild winters and diverse microclimates allow us to grow tropical and subtropical plants that look genuinely prehistoric. Tree ferns, giant bird of paradise, cycads, and massive-leaved plants all thrive here, especially in the coastal zones.

Key Takeaway: The plants in a dinosaur garden are not just decorative. They are genuine living fossils, some unchanged for hundreds of millions of years. This garden is a science lesson disguised as play.

What Plants Actually Grew During the Age of Dinosaurs?

The Mesozoic Era (252 to 66 million years ago) is the Age of Dinosaurs. During this period, the plant world was dominated by groups that are still around today, though many individual species have evolved or gone extinct. The following plant groups were part of dinosaur ecosystems and have living representatives you can grow in California.

Ferns (350+ Million Years Old)

Ferns predate dinosaurs by over 100 million years. They were a dominant part of the understory in Mesozoic forests. Many species alive today look virtually identical to their fossil ancestors.

Australian Tree Fern (Cyathea cooperi) - The most dramatic fern for a dinosaur garden. Grows a trunk up to 15 feet tall with a canopy of arching fronds. Looks exactly like a Jurassic forest plant. Thrives in coastal California with regular water and part shade. Fast-growing (up to 2 feet per year in ideal conditions).
Tasmanian Tree Fern (Dicksonia antarctica) - Slower-growing but hardier than the Australian tree fern. Thick, fibrous trunk. Very prehistoric in appearance. Part shade, regular water.
Sword Fern (Polystichum munitum) - California native fern. Tough, evergreen fronds. Grows naturally in the redwood forests of Santa Cruz County. Part to full shade, moderate water.
Maidenhair Fern (Adiantum spp.) - Delicate, arching fronds on dark stems. The genus dates back at least 200 million years. Native species grow along streams in Santa Cruz County. Shade, consistent moisture.
Staghorn Fern (Platycerium bifurcatum) - Mounted on a board or tree trunk, the antler-shaped fronds look like something from a prehistoric swamp. Grows well outdoors in coastal California. Part shade.

Cycads (280+ Million Years Old)

Cycads were one of the dominant plant groups during the Jurassic and Cretaceous periods. They were so abundant that the Jurassic is sometimes called the "Age of Cycads." Living cycads look almost exactly like their fossil relatives.

Sago Palm (Cycas revoluta) - Not actually a palm but a cycad. Stiff, dark green fronds radiating from a stocky trunk. Extremely slow-growing (adding only 1 to 2 inches of trunk per year) but long-lived (centuries). Full sun to part shade, drought-tolerant once established. The most commonly available cycad and the easiest for beginners. Important: all parts are toxic to pets and humans if ingested. Place accordingly.
Cardboard Palm (Zamia furfuracea) - Round, stiff leaflets with a textured, almost corrugated appearance. Low-growing (3 feet). Looks like a miniature Jurassic plant. Full sun to part shade. Drought-tolerant. Also toxic if ingested.
Dioon (Dioon edule) - Blue-green, arching fronds. One of the most visually striking cycads. Native to Mexico. Grows well in California coastal gardens. Slow, but worth the wait.

Ginkgo (270+ Million Years Old)

Ginkgo (Ginkgo biloba) - The last surviving species of an entire division of plants that was widespread during the dinosaur age. Fan-shaped leaves are unmistakable and unlike any other living tree. Brilliant yellow fall color. Medium-sized deciduous tree (40 to 80 feet at maturity). Plant a male tree (female trees produce notoriously smelly fruit). Full sun, moderate water. A living fossil in the truest sense. According to UC Berkeley paleobotany, ginkgo leaf fossils from 200 million years ago are essentially indistinguishable from the leaves on your tree.

Horsetails (350+ Million Years Old)

Horsetail (Equisetum hyemale) - Leafless, segmented green stems that look like bamboo. The genus is virtually unchanged since the Carboniferous Period (when giant horsetails grew 60 feet tall and formed ancient forests that became coal). Modern horsetail grows 2 to 4 feet tall. WARNING: extremely invasive. Grow only in a container with no drainage holes touching soil. Submerge the container in the ground for a natural look if desired, but do not plant directly in the ground. Part shade, wet soil.

Conifers (300+ Million Years Old)

Monkey Puzzle Tree (Araucaria araucana) - Bizarre, reptilian-looking branches covered in sharp, overlapping, scale-like leaves. The tree family (Araucariaceae) dates to the Jurassic. Grows well in coastal California (several large specimens exist in Santa Cruz and San Francisco). Slow to moderate growth. Full sun.
Coast Redwood (Sequoia sempervirens) - The genus dates back to the dinosaur age. Today's coast redwoods grow naturally in Santa Cruz County (Henry Cowell Redwoods, Big Basin). While obviously too large for most yards, seedlings in pots make a powerful talking point about deep time.
Dawn Redwood (Metasequoia glyptostroboides) - Known only from fossils until a living population was discovered in China in 1944. Deciduous conifer with feathery foliage and rust-colored fall color. Grows to 70 feet but is slow enough to enjoy in a garden for many years. Full sun, regular water.

Other Prehistoric-Looking Plants

Giant Bird of Paradise (Strelitzia nicolai) - Not actually prehistoric, but the massive, banana-like leaves look like they belong in a Cretaceous forest. Grows 15 to 20 feet. Full sun. Drought-tolerant once established.
Selaginella (Spike Moss) - An ancient genus of non-flowering plants that dates back over 300 million years. Low-growing, moss-like groundcover. Several species grow well in California shade gardens.
Elephant Ear (Colocasia or Alocasia spp.) - Massive, dramatic leaves up to 3 feet long. Looks like dinosaur food. Part shade, regular water, rich soil.

How Do You Design a Dinosaur Garden?

In-Ground Dinosaur Landscape

If you have a shaded corner of the yard (most prehistoric plants prefer part shade), you can create a Jurassic scene. Layer the plants by height: tree ferns at the back, cycads and bird of paradise in the middle, sword ferns and selaginella at ground level. Add a winding path of flat stones or bark through the planting. Place toy dinosaurs among the plants, partly hidden by foliage so kids discover them as they explore.

Container Dinosaur Garden (Small Space or Patio)

Use a large, shallow container (at least 20 inches wide) or a deep tray. Fill with potting soil and plant miniature ferns, small selaginella, and baby succulents as the "prehistoric landscape." Add small rocks and pebbles to create terrain. Place toy dinosaurs in the scene. This is essentially a fairy garden but with a dinosaur theme, and it works on any patio, balcony, or tabletop.

Container plant picks:

Button fern (Pellaea rotundifolia) for mini tree canopy effect
Selaginella 'Frosty' or 'Gold Tips' for groundcover
Small hen and chicks (Sempervivum) for rocky terrain
Irish moss (Sagina subulata) for "prehistoric meadow"
Mini mondo grass (Ophiopogon japonicus 'Nanus') for texture

The "Dig Site" Zone

Add a sandbox or a designated digging area near the dinosaur garden. Bury clean chicken bones (from a cooked rotisserie chicken), shells, interesting rocks, and toy dinosaur skeletons in the sand. Give kids small brushes (old paintbrushes work perfectly) and have them excavate like real paleontologists. This is one of the most engaging activities you can pair with a dinosaur garden.

What Materials Do You Need?

For an In-Ground Dinosaur Garden

Plants: 5 to 10 prehistoric species from the lists above. Budget $50 to $150 (tree ferns and cycads are more expensive than typical garden plants)
Mulch: Bark or leaf mulch to create a forest-floor look
Rocks and boulders: A few large rocks create a rugged, ancient landscape. Gather locally or buy from a landscape supply yard
Stepping stones: For a path through the garden
Toy dinosaurs: Weatherproof, realistic-looking figures. Budget $10 to $20 for a set
A small water feature (optional): A shallow bowl of water with fern fronds overhanging it creates a "prehistoric pond"

For a Container Dinosaur Garden

Large shallow container: At least 20 inches wide, with drainage holes
Potting soil
Miniature plants: 4 to 6 small ferns, selaginella, and succulents. Budget $15 to $30
Small rocks, pebbles, and sand: For terrain
Small toy dinosaurs

For the "Dig Site"

Sandbox or large shallow container filled with sand
Clean bones, shells, and interesting rocks to bury
Old paintbrushes and small trowels for excavation
Optional: toy dinosaur skeleton models

What Activities Can Kids Do in a Dinosaur Garden?

The Fossil Record Timeline (Ages 5 and Up)

Create a visual timeline in the garden using stakes and string. Mark major events: "350 million years ago: first ferns," "280 million years ago: first cycads," "230 million years ago: first dinosaurs," "66 million years ago: dinosaur extinction," "today: us." Place each plant next to its appearance date on the timeline. Kids are amazed to learn that ferns are older than dinosaurs.

Leaf Fossil Prints (Ages 4 and Up)

Press fern fronds, cycad leaflets, and ginkgo leaves into air-dry clay or salt dough to create "fossil" impressions. Let them dry and harden. Paint with metallic or earth-tone paint. These make excellent gifts, classroom show-and-tell items, and garden decorations. This activity connects directly to how real plant fossils form (by pressing into sediment that hardens into rock).

The Paleontologist Dig (Ages 3 and Up)

Bury items in the dig site sandbox and let kids excavate them using brushes and tools. Teach them to work carefully and slowly (like real paleontologists). Record what they find in a "field notebook." For older kids, create a grid system over the sandbox using string and have them record the location of each find on a map. This teaches the scientific documentation methods that real paleontologists use.

Spore Print Art (Ages 6 and Up)

Ferns reproduce by spores, not seeds (a key difference between prehistoric and modern plants). Collect a mature fern frond with visible spore cases (the brown dots on the underside). Place it spore-side down on white paper, cover with a bowl, and leave overnight. The spores will drop and create a delicate print pattern. This is real botany that connects directly to why ferns are considered "primitive" plants.

Deep Time Math (Ages 8 and Up)

Challenge older kids to calculate: if the earth were a 24-hour clock, and the earth formed at midnight, when did ferns appear? When did dinosaurs appear? When did humans appear? (Answer: ferns appear around 9:30 PM, dinosaurs around 10:56 PM, and modern humans at about 11:59:56 PM, four seconds before midnight.) This exercise, adapted from geological education materials used by the UC Museum of Paleontology, makes deep time viscerally understandable.

When and How Do You Plant a Dinosaur Garden in California?

Best Planting Time

Fall (October through November) is ideal for most prehistoric plants in California. The cooling temperatures, shorter days, and onset of rain create perfect establishment conditions for ferns and cycads. Tree ferns can also be planted in early spring (March) if you provide consistent water through the first summer.

Light Requirements

Most dinosaur garden plants prefer part shade to full shade, which makes this the perfect project for shady areas of the yard where sun-loving vegetables and flowers will not grow. Cycads tolerate more sun (part shade to full sun). Ginkgo trees need full sun.

Watering

Ferns and horsetails need consistent moisture. Mulch heavily (3 to 4 inches of leaf mulch or bark) to maintain soil moisture and create the forest-floor look. Cycads are more drought-tolerant once established. In coastal California, most dinosaur garden plants thrive with deep watering twice per week in summer and natural rainfall the rest of the year.

Soil

Most ferns and prehistoric plants prefer rich, well-drained soil with plenty of organic matter. Amend with compost before planting. Cycads prefer slightly sandier, well-drained soil. For containers, use a quality potting mix with added perlite for drainage.

Frequently Asked Questions

Are cycads safe around kids and pets?

All parts of cycads (especially the seeds) are toxic if ingested. The toxin (cycasin) is particularly dangerous to dogs. If you have pets or very young children who put things in their mouths, either skip cycads or place them in a protected spot that is not accessible to pets and toddlers. Ferns, ginkgo, and most other plants in this guide are non-toxic.

Can I grow a dinosaur garden in full sun?

Most ferns will scorch in full sun. If your garden gets full sun, focus on cycads (part shade to full sun), ginkgo (full sun), monkey puzzle tree (full sun), and elephant ear (partial shade). You can create shade by planting larger species first and filling in with shade-loving ferns beneath them as they grow.

How much does a tree fern cost?

Australian tree ferns typically cost $25 to $60 for a 1 to 5-gallon size at nurseries. Larger specimens with developed trunks can cost $100 or more. Tasmanian tree ferns are more expensive ($40 to $80 for small plants). These are investments that grow slowly but last for decades.

Will a dinosaur garden attract wildlife?

Yes. Fern gardens attract beneficial insects, salamanders (in moist areas), and birds that forage in the leaf litter. In Santa Cruz County, banana slugs love fern gardens (which kids find endlessly entertaining). A water feature adds additional wildlife habitat.

Where can I buy prehistoric plants in the Santa Cruz area?

The UCSC Arboretum carries unusual plants including cycads and tree ferns at their plant sales. San Lorenzo Garden Center stocks Australian tree ferns seasonally. For cycads and unusual conifers, check specialty nurseries like Jungle Music Palms and Cycads (San Diego, ships to California) or visit the Monterey Bay Nursery (wholesale, but their retail partners carry many of their plants).

A Garden That Spans Millions of Years

A dinosaur garden is a time machine. The fern your child plants today is essentially the same organism that a Stegosaurus walked past 150 million years ago. The cycad in the pot on your patio is a living representative of a plant group that saw the rise and fall of the dinosaurs and kept right on going. For a kid who loves dinosaurs, there is nothing more thrilling than realizing they can grow a piece of that world in their own backyard.

Want more creative garden projects for kids? Visit our Your Garden Toolkit page for free planting guides, seasonal checklists, and garden planning resources for California families.

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