Plant Spacing Calculator: How Many Plants Do I Need?

🌱 Plant Spacing Calculator

Calculate exactly how many plants you need for any garden bed, border, or landscape area

Quick Presets
📐 Calculator Inputs
Plants Needed
--
with overage
Total Area
--
sq ft
Plants Without Buffer
--
exact count
Plants Per Sq Ft
--
density
📊 Plant Spacing Density Reference
4.00
Plants/sqft @ 6 in
2.25
Plants/sqft @ 8 in
1.00
Plants/sqft @ 12 in
0.44
Plants/sqft @ 18 in
0.25
Plants/sqft @ 24 in
0.11
Plants/sqft @ 36 in
+15%
Offset vs Grid Gain
0.866
Offset Row Factor
📋 Plants Per 100 Sq Ft by Spacing & Pattern
SpacingGrid PatternOffset PatternMetric Equiv.
4 in (10 cm)9001,039969 / m²
6 in (15 cm)400462431 / m²
8 in (20 cm)225260242 / m²
10 in (25 cm)144166155 / m²
12 in (30 cm)100115108 / m²
18 in (45 cm)445148 / m²
24 in (60 cm)252927 / m²
36 in (90 cm)111312 / m²
48 in (120 cm)677 / m²
🌾 Recommended Spacing by Plant Type
Plant TypeTypical SpacingPatternNotes
Annual Flowers (Petunias, Marigolds)6–12 in (15–30 cm)Grid or OffsetCloser for mass color
Perennials (Coneflower, Salvia)12–24 in (30–60 cm)Offset preferredAllow for mature spread
Ground Cover (Creeping Thyme, Vinca)4–8 in (10–20 cm)OffsetTight spacing fills faster
Shrubs (Boxwood, Azalea)24–48 in (60–120 cm)GridBased on mature width
Vegetables (Peppers, Tomatoes)12–24 in (30–60 cm)Grid rowsVaries widely by crop
Herbs (Basil, Cilantro)6–12 in (15–30 cm)GridCompact varieties closer
Ornamental Grasses18–36 in (45–90 cm)OffsetDramatic when massed
Bulbs (Tulips, Daffodils)4–8 in (10–20 cm)Offset clustersGroup in odd numbers
🏗 Common Project Sizes
ProjectArea (sq ft)Plants @ 12 in GridPlants @ 12 in Offset
Small Flower Bed252529
Foundation Planting808092
Garden Border 20×4808092
Medium Bed 10×10100100115
Large Bed 20×15300300346
Veggie Garden 25×20500500577
Full Landscape 50×201,0001,0001,155
Commercial Bed 100×101,0001,0001,155
🔄 Flat / Tray Conversion Table
Tray SizePlants per TrayTrays for 100 PlantsTrays for 500 Plants
6-cell pack61784
4-pack425125
18-cell flat18628
36-cell flat36314
50-cell plug tray50210
72-cell plug tray7227
128-cell plug tray12814
💡 Spacing Tip: Always measure plant spacing from center to center, not from the edge of one plant to the edge of another. For offset (staggered) rows, shift every other row by half the spacing distance. This triangular pattern fits about 15% more plants in the same area while maintaining equal distance between every plant.
💡 Overage Tip: Add 5–10% extra plants to account for transplant failures, root damage during planting, and edge trimming around irregular bed shapes. For ground covers that need full coverage quickly, consider increasing to 15–20% overage, especially in shaded areas where establishment can be slower.

Note: This article is based on descriptions and conversations about Omni-plants from video game groups and various other resources.

The Omni-plant is a special plant that happens in The Sims 3. It enters the category of special plants. What makes it new is that it makes copies of everything it receives as food.

All About the Omni-plant in The Sims 3

That tiny bush can double several other plants and even some objects for instance certain books or fishes. It ranks between the most exciting finds of the game.

To receive an Omni-plant is not simple. It belongs to the very rare. Only Sims that reached the right level in gardening deserve to get one.

That requires many hours given to the improvement of gardening, before one can get to this plant. In The Sims 3 there are separate garden challenges that unlock the Omni-plant. Doing tasks as Unusual Good, Rare and the Omnificent chain forms part of the process.

Along the way the Sims also learn to grow other funny things, as plants for steak, egg, cheese and hamburger.

The skill of gardening has various grades. At the seventh level Sims can plant odd seeds, as lime, watermelon, onion and potatoes. To the usual seeds belongs apple, grapes, lettuce and tomatoes.

Such special plants as Alive Fruit, Fatal Flower, Flame Fruit and Money Tree come only by means of challenges. The Omni-plant sits in that same exclusive gruop together with plants for cheese and eggs, likewise as for hamburgers and steak.

The feeding of the Omni-plant forms the main mechanism. Almost every object can serve as food, and it will produce copies of it. Even so there are exceptions.

Not everything works well. Here comes the tricky spot, the only way to get an Omni-plant from an Omni-plant is by feeding it by means of another Omni-plant. Because of that, finding seeds that it produces matters a lot in the start.

There are also some known mistakes. Sometimes the Omni-plant does not arrive by means of mail. Sometimes it stops growing or gets stuck in the inventory.

One famous bug relates too feeding by means of Marine Slime, which can stop the plant in the state of growth during harvest, but it stays stuck for days. Too many objects in the inventory could cause some of these troubles.

To reach perfect quality of an Omni-plant takes effort. A Sim with the trait green thumb, that talks with the plant, has a small chance to improve its quality by one grade per talk. That is the only known way to reachperfection.

The Omni-plant played a big role in the fun and discovery of new objects, when The Sims 3 launched fresh packs.

Plant Spacing Calculator: How Many Plants Do I Need?

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