What the source spacing covers
The reference is USU's ordinary spinach guide: plants 3 inches apart within rows 12 inches apart. Treat the 3-inch figure as the within-row center interval for retained plants and the 12-inch figure as the between-row reference. Neither number by itself tells you how wide a bed should be, how many rows fit, or where paths go.
The source also notes two boundaries. Baby-leaf harvesting is a separate goal, so do not assume the same retained-plant spacing applies to a cut-and-come-again plan. New Zealand spinach is a different crop, so its spacing should not be borrowed from this ordinary spinach figure.
- Write down the crop as ordinary spinach, not baby-leaf or New Zealand spinach.
- Record the 3-inch within-row interval and the 12-inch between-row reference from the source.
- Decide separately how much access space, bed width, and adjacent-row clearance your garden needs.
Source context: Utah State University Extension
Sowing, thinning and established plants
Sowing density and final retained spacing are different decisions. You may sow more seed than the final count and then thin to the marked positions. The 3-inch interval describes the retained plants you intend to keep, not a guarantee about seed germination or seedling survival.
Marking positions before thinning helps you compare what is actually in the row with the plan. Count retained plants, not seeds sown and not seedlings that emerged. If a position fails, the plan shows the gap rather than hiding it.
- Mark the intended retained-plant centers along the row before thinning.
- Thin seedlings so the kept plants sit at those marked centers.
- Count the retained plants after thinning and note any empty positions.
Source context: Utah State University Extension
Worked example: one 96-inch row
This is a geometrical example, not crop advice for every garden. Take one measured row 96 inches long, choose 3-inch centers, and set a 1.5-inch margin at each end. The first center falls at 1.5 inches and the last at 94.5 inches. Counting positions at 3-inch intervals across that span gives 32 retained plants.
The 32 is a count of retained-plant positions in that single row. It is not a yield estimate, a seed count, or a whole-garden plant total. One row is not an entire garden layout: you still need to choose access, supports if any, adjacent-row spacing, and mature habit separately, without inventing distances beyond the source notes.
- Measure the row length in inches or centimeters.
- Enter the row length, the 3-inch center interval, and the 1.5-inch margin at both ends into the linked row calculator.
- Check that the first center is 1.5 inches from the start and the last is 1.5 inches from the end.
- Confirm the calculator reports 32 positions for this example.
Source context: Utah State University Extension
Turning the count into a marked plan
Count the plants in the example row first, then enter your own width and row distance before choosing a grid. Use the planting position count as a careful check on what fits, not as a substitute for your own measurements.
Keep the between-row 12-inch reference visible when you sketch adjacent rows, but decide access and bed layout yourself. If your goal changes to baby-leaf harvesting or a different crop, start a new spacing decision rather than reusing this count.
- Label the row with its length, center interval, and end margins.
- Mark each retained-plant position and count the markers.
- Sketch adjacent rows and access separately, using the 12-inch between-row reference as a starting fact.
- Recheck the crop goal before reusing the plan.
Source context: Utah State University Extension
Check your measured example
One measured 96-inch row, with selected 3-inch centers and 1.5-inch margins at both ends. Count 32 retained plants.
Reference and growing system: USU’s ordinary spinach guide gives plants 3 inches apart within rows 12 inches apart. Baby-leaf harvesting is a separate goal, and New Zealand spinach is a different crop.
| Quantity | Calculated result |
|---|---|
| Usable row length (in) | 96 |
| Selected center spacing (in) | 3 |
| Margin at each row end (in) | 1.5 |
| Positions in this row | 32 |
| First center from row start (in) | 1.5 |
| Last center from row start (in) | 94.5 |
| What is being counted | retained plants |
The example uses one 96-inch row, 3-inch centers, and 1.5-inch margins at both ends. The first center is at 1.5 inches and the last at 94.5 inches, giving 32 retained-plant positions. This is a geometrical count for one labeled row, not crop advice, a yield estimate, or a full garden layout.
Count this row in the spacing calculator ↗Example inputs explain the method. Review the source context, chosen cultivar and actual site before planting or ordering.
Your before-you-plant checklist
- Crop is confirmed as ordinary spinach, not baby-leaf or New Zealand spinach.
- Row length is measured in inches or centimeters.
- 3-inch center interval and 1.5-inch end margins are entered for the example.
- First and last centers are checked at 1.5 inches and 94.5 inches.
- Retained plants are counted, not seeds sown or seedlings emerged.
- Adjacent rows, access, supports, and mature habit are decided separately.
Questions that come up while planning
How far apart should ordinary spinach plants be within a row?
USU's ordinary spinach guide gives plants 3 inches apart within rows 12 inches apart. The 3-inch figure is the within-row center interval for retained plants in this guide.
Does the 32-plant example apply to my whole garden?
No. It counts retained-plant positions in one 96-inch row with 3-inch centers and 1.5-inch margins at both ends. It is a geometrical example, not a whole-garden layout or a yield estimate.
Can I use this spacing for baby-leaf spinach or New Zealand spinach?
The linked guide treats baby-leaf harvesting as a separate goal and New Zealand spinach as a different crop. Do not assume the ordinary spinach 3-inch spacing applies to either without a separate decision.
Sources & method
Horticultural guidance is linked to its original source and regional context. Geometry and unit conversions are calculated separately. Read how we prepare and check a page.
- How to Grow Spinach in Your GardenUtah State University Extension