How many bulbs per square foot: tulips, daffodils and crocus

A square foot is 12 inches on each side. At 6 inches apart, 2 bulbs fit along one side and 2 rows fit across, so 2 x 2 = 4 bulbs. At 3 inches it's 4 x 4 = 16, and at 4 inches it's 3 x 3 = 9. At 8 inches you get 1.5 x 1.5 = 2.25: 9 bulbs fill a 2 x 2 ft patch.

That makes the count a question of spacing, and extension pages don't agree on spacing. The table turns four pages' figures into bulbs per square foot.

Spacings are each page's own figures. Bulbs per square foot is 12 divided by the spacing, squared; we did that arithmetic.

Source: Iowa State Extension, How deep should I plant tulips?, checked October 8, 2026; Kentucky Extension, HortFacts 52-04 Spring Flowering Bulbs, checked October 9, 2026; NC Extension (Wayne County), Plant Bulbs This Fall for Spring Flowers (2025), checked October 9, 2026; Illinois Extension, Select and plant spring-flowering bulbs now (2020), checked October 9, 2026.

• 4tulips or daffodils per sq ft at 6 inIowa State Extension, How deep should I plant tulips?, October 8, 2026
• 16crocuses per sq ft at 3 inIowa State Extension, How deep should I plant tulips?, October 8, 2026
• 128large bulbs in a 4 x 8 ft bed at 6 inArithmetic
• 5 to 6large bulbs, the smallest group Kentucky suggestsKentucky Extension, HortFacts 52-04 Spring Flowering Bulbs, October 9, 2026

Illinois spaces bulbs 6 to 12 inches apart to allow for the spread and future divisions. That plan is for bulbs that stay and multiply. Kentucky's 4 to 8 inches and the North Carolina page's 3 to 6 inches pack large bulbs closer for a fuller first spring.

Source: Illinois Extension, Select and plant spring-flowering bulbs now (2020), checked October 9, 2026; Kentucky Extension, HortFacts 52-04 Spring Flowering Bulbs, checked October 9, 2026; NC Extension (Wayne County), Plant Bulbs This Fall for Spring Flowers (2025), checked October 9, 2026.

Tulips are the plain case for tight spacing. Kentucky Extension says tulips will generally have to be replaced every 2 to 4 years, so there's little reason to leave them room to multiply. Daffodils, crocuses and grape hyacinths naturalize in most Kentucky gardens, and they can take the wider end.

Source: Kentucky Extension, HortFacts 52-04 Spring Flowering Bulbs, checked October 9, 2026.

1. 1

   Measure the planting area

   Measure the length and width in feet. For a raised bed, measure inside the boards.

2. 2

   Pick a spacing

   Start with Iowa State's 6 inches for tulips and daffodils and 3 inches for crocuses and grape hyacinths. If the bag gives its own spacing, use that.

   Source: Iowa State Extension, How deep should I plant tulips?, checked October 8, 2026.

3. 3

   Type it into the calculator

   The bulb planting calculator counts whole rows and leaves half a spacing at each edge, so it won't promise bulbs that don't fit.

4. 4

   Compare with the rule

   Square feet times bulbs per square foot should come out close to the calculator. If it's far off, check that the spacing is in inches and the bed in feet.

5. 5

   Print the planting map

   Write the count, the spacing and the planting date on the map, so next fall you know what you planted where.

For a round bed or a curved drift, work out the area in square feet and multiply by bulbs per square foot. A circle 4 feet across is about 12.6 square feet, so at 6 inches that's about 50 tulips. The figure runs a little high because the curved edge loses part of a row. Order it anyway and keep the extras for the next gap.