Asparagus Planting Calculator
Asparagus crowns and yearly harvest weight from row length.
What it does
Asparagus rewards patience with decades of spears. Crowns planted deep in trenches build roots for two years before real cutting.
The tool above divides row by eighteen inch spacing. Twenty feet plants 13 crowns for 6.5 lb yearly. The metric match is 6.1 m for 13 crowns and 3 kg.
Half a pound per crown suits mature beds. Young plantings trickle while roots establish.
Trenches feed longevity. Compost rich depth grows crowns that outlive gardeners.
Male hybrids outyield. No seed energy means thicker spears season long.
How to use
- Pick imperial (ft) or metric (m).
- Enter row length.
- Read crowns first.
- Read harvest next.
- Wait two years, then cut.
Formula
- row
- Row length.
Metric uses 46 cm spacing with 0.23 kg per crown. Harvest waits two full years.
Worked example
Example: 20 ft row
Imperial defaults: 20 ft row. These are also the default values, so the page opens on this answer.
- Row: 20 ft at 18 in spacing.
- Crowns: round(20 x 12 / 18) = 13 crowns (13.33 rounds down).
- Harvest: 13 x 0.5 = 6.5 lb.
- Tool shows 13 crowns, 6.5 lb harvest, Wait 2 full years.
Reference table
| Row | Crowns | Harvest |
|---|---|---|
| 10 ft | 7 crowns | 3.5 lb |
| 20 ft | 13 crowns | 6.5 lb |
| 40 ft | 27 crowns | 13.5 lb |
Limits
- Count math only. Variety rules harvest.
- Two year wait before cutting.
- Beetles need patrols.
- Drainage gates bed life.
Common mistakes
- Cutting year one to weakness.
- Shallow planting short lives.
- Female seedlings everywhere.
- No mulch on crowns.
- Skipping beetle patrols.
Try it yourself
Quick checks. Answers sit tucked under each question.
40 ft row?
round(40 x 12 / 18) = 27 crowns after rounding (26.67 rounds up). Harvest is 27 x 0.5 = 13.5 lb.
10 m metric?
round(10 x 100 / 46) = 22 crowns after rounding (21.74 rounds up). Harvest is 22 x 0.23 = 5.1 kg after rounding (5.06).
Questions
Crowns for 20 ft?
Divide row inches by spacing. Here round(20 x 12 / 18) = 13 crowns.
Harvest per crown?
Near half a pound per mature crown yearly in this plan.
Wait to harvest?
Wait two full years before real cutting. Patience builds roots.
Male varieties?
Male hybrids yield more with no seeding energy spent.
Trench planting?
Yes. Deep trenches with compost feed decades of spears.
Pest plans included?
No. Beetles need garden patrols.