Mushroom Grow Blocks: A Homeschool Science Lesson
A Living Biology Lesson That Fits Inside a Grow Block
Last year, my school bought two grow blocks (shiitake and blue oyster) from you to use in my science lab to teach my 3rd grade students about fungi. It was such a huge success that we would love to do it again! - Third grade science teacher at a private, all-girls school
A bean sprout takes a week just to break soil. A butterfly kit takes two. By the time anything visibly changes, the curriculum has already moved on — schools rarely leave room for a lesson that takes weeks to pay off.
A mushroom grow block moves faster. Within days, you can watch mycelium — the thread-like network that makes up a mushroom's body — respond to changes in humidity and temperature, and within a week or two, mushrooms form. Grow it alongside a slower plant unit and you've got a whole ecosystem running in the same classroom, on two different timelines.
We've seen this play out with real students. A private girls' school science teacher used one of our grow blocks as a live classroom demonstration. A preschool teacher used one with four-year-olds as a sensory and observation project. We led a hands-on mushroom session for a nature-based preschool and left a grow block behind so the lesson could continue for another week. Three different classrooms, two different age groups — all watching the same biological process.
Here's how to set it up, what students learn, and what these educators did with it.
A Science Lesson That Moves at Kid Speed
Most classroom science kits ask kids to wait. Mushrooms give them something to watch.
A grow block arrives already colonized with mycelium — the organism is alive and active from day one. Once conditions shift (more light, fresh air, a humidity increase), the mycelium responds by forming pins, then fruiting bodies, within days.
The block is also genuinely unpredictable. No two blocks fruit identically. Room temperature, humidity, and misting frequency all shape the outcome — every household or classroom running one collects its own data, without anyone needing to manufacture variation.
How to Set It Up as a Lesson
There's no single right way to do this — it depends on your setting.
In a single classroom: Grow one block together. Assign rotating student "observers" to record daily changes — humidity, temperature, and visible growth stage. This works well as a shared, ongoing project rather than a one-day demo.
For homeschool families: Order one block per household and compare results. Growing conditions vary from home to home, which turns this into a real comparative study — whose block fruited first, and why? Room temperature at night, misting frequency, light — this is where kids start forming their own hypotheses.
For remote or distributed classes: Have each student grow their own block independently, with a daily digital check-in — a shared photo log or spreadsheet works well. This keeps a distributed group observing the same phenomenon on their own timelines.
In each setup, the daily observation habit does the real teaching. The mushrooms give students something worth observing.
What Kids Actually Learn
Underneath the "watch it grow" appeal, the biological process includes:
- Mycelium and fungal life cycles. Unlike plants, fungi don't photosynthesize — they get energy by breaking down organic material. Watching mycelium colonize a substrate is a hands-on introduction to decomposition, a concept most kids only encounter in the abstract.
- Environmental triggers. Fruiting is a direct response to specific conditions — a drop in temperature, an increase in humidity, exposure to fresh air. This is a clean, observable example of cause and effect in biology.
- Patience and long-term observation. Not every lesson wraps up in one class period. Watching something develop over one to two weeks builds a different kind of scientific habit than a single-day experiment.
None of this requires prior mycology knowledge to teach. The block does the biology; your role is mostly to prompt observation and ask good questions along the way. And if a student has a question of their own, they can send it to Farmer Elizabeth — she'll answer it.
Real Classrooms, Real Results
We led a hands-on mushroom session for a group of four-year-olds at A Place to Grow, a nature-based preschool in Brentwood, NH, and left a grow block behind so the lesson could continue for another week. Watching mushrooms through the eyes of a preschooler — genuine curiosity, no preconceptions about what a "science lesson" looks like — was a reminder of how this kind of learning happens when the material itself is interesting.
A science teacher at a private girls' school brought a grow block into her classroom as a live demonstration, giving older students a chance to observe fungal biology in person, not just from a textbook diagram. Another preschool teacher used a block with her class as a sensory and observation activity, giving younger students an early, low-pressure introduction to noticing change over time.
Different ages, different formats, same lesson: biology is memorable when you can watch it happen.
Follow-Up Lessons After the Harvest
The lesson doesn't have to stop at harvest.
- In the kitchen. This is the payoff — [cook what you grew: recipes here →]. Cooking mushrooms is its own bit of science: heat drives off water and concentrates flavor, which is why a hot, uncrowded pan makes the difference.
- Zoom in. Grab a magnifying glass or a macro lens and study the gill structure, spore pattern, and texture up close. A mushroom looks different at every distance.
- Let it decompose. Once a block stops producing, set it outside instead of the trash. You may see another flush or two form on top even as it breaks down — while insects and worms work from the bottom, turning the spent block into compost. A full-circle look at the same decomposition process that feeds next season's soil.
Bring This to Your Group
If you're a teacher, homeschool parent, or program coordinator interested in bringing this into your own classroom or co-op, we offer both self-serve grow blocks and guided sessions — in person or over Zoom — for preschools, homeschool groups, garden clubs, and libraries.
Shop grow blocks → or reach out to schedule a class visit.
FAQ
Do I need any prior mushroom-growing experience to run this as a lesson? No. The grow block arrives ready to fruit — your role is mostly guiding observation, not managing a complex growing process. See instructions here.
How long does it take from setup to harvest? Once conditions are right, fruiting typically begins within days, with a full harvest ready over one to two weeks — fast enough to fit within a single unit or month of homeschool lessons.
What age group is this appropriate for? We've seen this used from preschool through upper school — the observation and data-tracking angle scales up or down depending on the age group.
Can I do this with a group of students who each have their own block, but aren't in the same location? Yes — this works well as a remote or distributed project, with each student logging daily observations and comparing results as a group. During COVID, we ran large Zoom classes where every attendee brought their block to the screen for a live Show & Tell.
Do you offer live or virtual class visits? Yes — reach out to schedule an in-person or Zoom session for your classroom, homeschool group, or program.