YOUR SIMPLE GROWING PLAN
One pot. Here’s the plan.
Before you start Plant after frost danger when mix reaches at least 65°F; this approximately 110-day variety needs a long warm season. Harvest before frost.
What you need · pot, mix & supplies
- One 20-gallon grow bag or draining container, roughly 20 inches wide and at least 15 inches deep
- 1 healthy rooted Vardaman Bush slip from an edible-crop supplier
- Fresh potting mix, a watering can, and room for vines to spread
The soil
Miracle-Gro Organic Potting Mix (US, SKU 78951430). Contains starter nutrients; follow the feeding instructions on your actual bag.
A sunny outdoor patio with a long, warm growing season. Start with a sweet potato slip.
Choose a container labeled 20 US gallons, roughly 20 inches across and at least 15 inches deep, with drainage. Shapes vary; width alone does not prove its volume.
Choose an edible compact variety such as Vardaman Bush.
See the planting illustration
- 01
Buy a slip, not seed pieces
A slip is a small shoot grown from a sweet potato. Buy one healthy plant with a few leaves and young roots. Choose a food-crop variety; a decorative sweet potato vine is selected for foliage.
- 02
Wait for warm conditions
After frost danger, wait until the mix is at least 65°F. Fill the container, leaving room below the rim. Put it in its final sunny location before watering makes it heavy.
- 03
Plant the lower stem
Set the slip in the center, burying its roots and about 4 inches of lower stem while leaving the upper leaves above the mix. Use a slip long enough for that depth. Firm gently and water through; keep the rooting area moist while it establishes.
- 04
Let it spread, then lift
Allow the vines to trail clear of walkways. Start checking a root near the expected maturity date. Harvest before frost, easing roots out of the mix instead of pulling on the vines.
Other ways to start
Make a slip from a seed root+
Buy a healthy sweet potato sold for propagation. Lay it in a shallow tray of damp mix, cover with about 2 inches of mix, and keep it warm. After shoots develop, grow them in bright light. At about 6–8 inches tall, separate one and root it before moving to the big pot. Allow about 6 weeks for this extra step.
Root a vine cutting+
A cutting from a healthy edible sweet potato vine can make another plant. Root the lower nodes in moist mix, keeping leaves above it. A nursery slip is simpler for the first crop, and the new plant still needs a full warm growing season.
YOUR EVERYDAY ROUTINE
Water & fertilizer at a glance.
- Water when
- Keep a new slip evenly moist for two weeks. Later, water as the top inch starts drying until drainage begins. Avoid repeated heavy soaking near harvest. Empty the saucer or outer pot after draining.
- Fertilizer
- Espoma Garden-tone (US 3-4-4)
- Amount
- 2½ level tablespoons for the entire 20-inch-wide container
- What that amount covers
- Dry granules for the whole pot. Label rate: 1½ teaspoons per 4 inches of measured diameter; do not calculate from gallon capacity.
- How often to feed
- No more often than monthly while growing.
- When to start or pause
- Skip feed at planting. Follow the potting-mix bag’s starter-feed period; “up to 2 months” is not an exact guarantee. Skip near harvest.
Scatter granules around the outer edge, away from the stem, then water in. Use only one feeding program.
Use level measures and the exact US formula shown. If your label differs, follow it; do not transfer this dose to another formula or combine feeding programs.
See the watering & feeding illustrations
US PRODUCT REFERENCE
Espoma Organic
Garden-tone
3-4-4Granular: measure onto growing mix
Check the official US product ↗Illustrated reference; check the manufacturer’s current packaging and US label.
When to expect a root harvest
Utah State lists Vardaman Bush at about 110 days from planting; cooler conditions can delay it. This one-slip pot is a small harvest experiment. Root number and size vary, and the container needs much more room than an herb pot.
Allow enough warm growing months
Set the slip outside after frost danger has passed and the potting mix reaches at least 65°F. Give this approximately 110-day variety a long warm season. Start checking roots before fall nights become cold; harvest before frost rather than waiting for frost to kill the vines.
For regional planting windows, find your local Cooperative Extension office ↗.
Something looking off?
What are sweet potato slips?+
Slips are rooted shoots grown from a mother tuber. This beginner plan plants one slip per large pot. Burying whole grocery sweet potatoes is a different, less predictable method.
How big a pot do sweet potatoes need?+
Use about 20 gallons for one plant in this recipe. A 5-gallon bucket is too small for a roomy beginner harvest.
How long do sweet potatoes take to grow?+
Many varieties need roughly 90–120 warm days. Count back from your frost date and check the slip’s maturity rating.
Why do I have vines but tiny roots?+
The season may be too cool or short, the pot too small, or harvest too early. Confirm variety days-to-maturity, sun, and container size.
How do I cure and store them?+
For a controlled cure, Mississippi State gives 80–85°F and 85–90% relative humidity for 7–10 days. A warm, covered, ventilated home location may provide only partial curing; a cool porch is not equivalent. Spread roots in one layer, protect them from rain, and never seal them wet. Store sound roots at 55–60°F with airflow. Keep raw roots out of the refrigerator and inspect for decay.
Choosing edible slips and a roomy pot
Choose a compact edible sweet potato slip
Vardaman Bush is the named starting option here. “Bush” still means a leafy plant needing room around the container. A named edible slip also makes the expected harvest time easier to check.
Allow room for this container project
Maryland Extension reports successful 15–20-gallon containers. One slip in a 20-gallon pot is our uncrowded starter layout, not a tested yield promise. The 20-inch width is a shopping example; buy by stated capacity and measure the actual width before calculating fertilizer.
Help with your next step.
- Set up a pot that drains
Choose drainage holes and manage the saucer before you plant.
- Read the fertilizer already in your mix
Check the actual bag before adding a second fertilizer program.
- Compare four other edible starter pots
The chart covers spinach, basil, cherry tomato and blueberry. Use it to compare alternatives; their pot sizes and feeding recipes do not apply to this plant.
Sources, dates & detailed PDF
Editorial plans, not results from a Plant Care Steps growing trial. Compiled with AI assistance; they have not yet had an independent horticultural review. Editorial approach.
- Maryland Extension: warm planting, moisture, harvest, and home curing ↗
- Utah State: Vardaman Bush, slips, and vine cuttings ↗
- Ask Extension: reported success with 15–20-gallon containers ↗
- Mississippi State: slip depth, establishment water, curing, and storage ↗
- Espoma: Garden-tone container dose and application ↗
- Manufacturer: starter feed in the named potting mix ↗
- Manufacturer: US fertilizer formula and application directions ↗
Something needs updating? Suggest a correction
Published · Updated
Sources checked View sources ↗
Detailed PDF ↓Full reference edition with expanded explanations and illustrations. Its publication dates appear in the file.
