Arizona families, you made it. After Phoenix hit 102°F on Oct. 9, a weekend of storms swept through and the forecast dropped to highs in the mid-70s with nights near 58°F. For desert gardeners, that cooldown is the starting gun.
While most of the country is putting gardens to bed, the low desert is just getting going. The University of Arizona Cooperative Extension's Vegetable Planting Calendar for Maricopa County lists October and November as seed-sowing months for kid-friendly crops like radishes, carrots, lettuce, spinach, beets, peas and kale.
There's just one catch every Arizona gardener runs into: our native soil. Rocky, sandy or hard-packed ground behaves very differently from the dark, crumbly soil in seed-packet photos. That makes it the perfect place to start a science unit.
What your kids will learn
Grades K–5
- What plants need to grow: sunlight, water, soil and space
- How different soils look, feel and hold water
- What makes a test "fair" (changing only one thing)
- Watching a seed sprout and naming roots, stems and leaves
Grades 6–12
- Soil structure, drainage, moisture retention and aeration
- Independent, dependent and controlled variables
- Calculating garden bed area and volume and planning plant spacing
- Measuring and graphing growth, then drawing evidence-based conclusions
This week's activity: The backyard soil drainage race
- Collect two soils. Dig a cup of soil from your yard (about 4 inches down) and grab a cup of store-bought potting mix.
- Look and feel. Pour each onto a paper plate. Kids describe the color, texture and smell, and squeeze a damp pinch to see if it holds together or crumbles.
- Build the test. Poke a few small holes in the bottoms of two plastic cups. Fill each with the same amount of soil (one native, one potting mix) and set each cup over a clear jar.
- Predict. Which soil will let water through faster? Write the guess down.
- Pour and time. Pour the same amount of water (say, one cup) into each at the same moment. Time how long until it stops dripping, and measure how much water collected in each jar.
- Plant a mini-test. Sow a few radish or lettuce seeds in each soil and keep them in the same spot. Radishes are fast and a calendar-approved October crop. Record which soil sprouts first.
Talk about what you found: water that rushes straight through leaves little behind for roots, and water that won't soak in can drown them. Gardeners solve this with better growing media, and many desert gardeners grow in raised beds where they control the soil.
Take it further: two ways to grow the lesson
Want a full outdoor garden course? The Raised Garden Bed Plant Science Kit turns your backyard into a hands-on life science lab. Kids start seeds indoors, transplant them into their own bed, and track growth from seed to harvest.
- In the box: a 6 × 3 × 1 ft galvanized steel raised bed (open-bottom, rust-resistant coating), 5 peat pots with seed-starting soil, and 5 different seed varieties
- Curriculum and worksheets: 5 lessons for K–5 or 6–12 (choose at checkout), plus a garden planning map, growth tracking chart and reflection sheet or lab report template
- Good to know: filling the full bed takes additional garden soil (about 18 cubic feet), which is a great volume-math lesson for older kids
Want to stay at the kitchen table? The Soil Science Experiment Kit (4 Pots) takes this week's drainage race further, with side-by-side pots comparing potting mix and coconut coir, two fast-sprouting seed varieties, and 5 lessons with worksheets for K–5 or 6–12. Sprouting typically begins in 3–7 days.
Join the growing community
Every kit purchase includes an invitation to Aardvark's Seed Planting For Little Hands, our private group for families using our kits. Share your drainage-race results and garden photos with young growers across Arizona, Arkansas, West Virginia and beyond. While other states' gardens are winding down, Arizona kids will be the ones posting fresh sprouts all winter.
Ready to plant?
The weather has turned, the planting calendar says go, and your kids already have the question to investigate. Pick the kit that fits your space:
- Raised Garden Bed Plant Science Kit (6 × 3 × 1 ft) – Outdoor Garden Lab with Curriculum & Worksheets: $113.97
- Soil Science Experiment Kit (4 Pots) – Compare Growing Media, with Curriculum & Worksheets: $39.90
Get the Raised Garden Bed Science Kit
Sources: Hoodline Phoenix (Oct. 9, 2026); University of Arizona Cooperative Extension, Vegetable Planting Calendar for Maricopa County (az1005).
