Most gardeners assume basil is the highest-ROI herb. It’s expensive at the store, easy to kill before you use it, and the plant seems to earn its bed space. The math says otherwise. Dill returns 5.5 times the seed cost. Parsley and cilantro beat it on gross value. Basil comes in fourth.
This comparison uses actual frontmatter data from the crop encyclopedia on this site - the same numbers the ROI estimator uses, sourced from USDA AMS Specialty Crop Market News and cross-referenced with university extension yield data. All figures are per plant per season unless noted.
The Numbers
| Herb | Yield (lb) | Retail price/lb | Gross value | Seed/plant cost | Net value | ROI multiple |
|---|---|---|---|---|---|---|
| Dill | 2.0 | $5.50 | $11.00 | $1.99 | $9.01 | 5.5× |
| Parsley | 2.0 | $6.00 | $12.00 | $2.49 | $9.51 | 4.8× |
| Cilantro | 1.5 | $6.00 | $9.00 | $1.99 | $7.01 | 4.5× |
| Basil | 0.5 | $14.99 | $7.50 | $3.50 | $4.00 | 2.1× |
| Mint | 0.5 | $15.00 | $7.50 | $4.00 | $3.50 | 1.9× |
| Rosemary | 0.5 | $12.00 | $6.00 | $3.49 | $2.51 | 1.7× |
| Thyme | 0.25 | $12.00 | $3.00 | $2.99 | $0.01 | 1.0× |
| Chives | 0.25 | $8.00 | $2.00 | $2.49 | -$0.49 | 0.8× |
Retail prices from USDA AMS Specialty Crop Market News 2023-2024 for fresh culinary herbs. Yield figures from USDA ARS and land-grant university extension trial data. Net value = gross value minus seed/transplant cost.
Dill wins on the ROI multiple because it combines a high per-season yield (2.0 lb from a succession planting off one packet) with cheap seed ($1.99). The price per pound at retail ($5.50) is lower than basil, but the volume advantage overwhelms that. Parsley and cilantro run nearly identical profiles: both yield 1.5-2 lb per season, both retail at $6/lb, and both have low seed costs under $2.50.
Basil’s $14.99/lb retail premium doesn’t save it. At 0.5 lb per plant per season, the gross value is only $7.50 - less than parsley’s $12.00, despite basil costing three times as much at the grocery store. The yield gap is the problem.
At the bottom, thyme barely breaks even on year-one math, and chives runs slightly negative. This doesn’t mean they’re bad garden plants - it means the year-one accounting misses the point for perennials. More on that below.
The Top Three: Where the Real Savings Come From
Dill (5.5×)
The yield number - 2.0 lb per season from one $1.99 packet - requires succession planting to achieve. A single spring sowing of dill bolts to seed in 6-8 weeks. From that same packet, three to four staggered sowings spaced 3-4 weeks apart yield harvestable foliage through most of the summer.
Fresh dill (Anethum graveolens) at a mid-tier grocery store runs $3-5 per small bunch, typically 0.5-1 oz - the equivalent of $48-80 per pound once you work the math on the bunch size. USDA AMS Specialty Crop Market News surveys the wholesale and retail market; the $5.50/lb figure used here is a conservative midpoint for loose-leaf dill; retail bunches are often priced higher per pound-equivalent.
The catch with dill is that it doesn’t store. Fresh dill wilts within a few days of harvest. The value case only holds if you’re actually using it - blanch-and-freeze works for dill in cooked applications (soups, braises) but destroys the texture for fresh use. Grow it in successions sized to your weekly usage, not in a big single planting.
Dill seed has a secondary market at $10-15/lb at specialty food stores. If you let one succession go to seed and harvest the seed heads before they shatter, you’re adding a second product from the same planting. Dill seed is the same plant but a different culinary product - used in pickling brines, rye bread, and spice blends.
Parsley (4.8×)
Parsley’s yield advantage over basil is the single most underappreciated fact about herb garden economics. At 2.0 lb per plant per season from a slow-but-steady biennial that you can cut repeatedly, parsley beats basil on gross value despite retailing for a third of the per-pound price.
Petroselinum crispum is a biennial: it produces vegetative growth in year one and flowers in year two. For culinary use, treat it as an annual and pull plants when they start to bolt in the second spring. The first-year plant gives you the yield shown in the table. A single established curly or Italian flat-leaf parsley plant in full production will produce 1.5-2 oz of usable herb per week during its peak season - that’s 1.5-2 lb over 10-12 weeks of active harvest.
Flat-leaf parsley (P. crispum var. neapolitanum, also called Italian parsley) yields more and has better flavor than curly; most extension programs report flat-leaf types outproducing curly by 15-20% in side-by-side trials (University of California Cooperative Extension, Herb Production, 2019). The yield difference is meaningful enough to recommend flat-leaf unless curly is specifically required.
Retail price comparison: fresh flat-leaf parsley at grocery stores runs $1.50-3.00 per bunch; retail equivalent per pound is $6-12 depending on bunch weight. The $6.00/lb figure used here is conservative. In farmers markets, $8-10/lb is common.
Cilantro (4.5×)
Cilantro (Coriandrum sativum) is the ROI case that scales poorly without succession planning and scales extremely well with it. A single sowing bolts in 4-6 weeks, especially in spring warmth. The 1.5 lb per season yield requires 4-5 sowings across spring and fall cool-season windows.
The retail price case is strong: fresh cilantro at $6/lb average, with many markets running $8-12/lb for organic loose cilantro, represents significant grocery savings for households that cook Mexican, Thai, Indian, or Vietnamese food regularly. A full-sized bunch at an ethnic grocery store might cost $0.50-0.99 but weigh only 1-1.5 oz - that’s $5-16/lb equivalent.
Succession sowing schedule for zones 5-6: start sowings 2-4 weeks before last frost (cilantro tolerates light frost), continue every 2-3 weeks through May; pause in summer heat; resume in mid-August for a fall run. The fall sowings are often more productive than spring ones because the plant holds longer in cooling temperatures before bolting.
Bolt-resistant varieties exist and are worth using for warm-weather sowings: ‘Calypso’, ‘Santo’, and ‘Long Standing’ from Johnny’s and other suppliers delay bolting meaningfully. Not indefinitely - all cilantro eventually bolts - but 10-14 extra days of leaf harvest per sowing adds up across multiple successions.
The Middle Tier: Basil and Mint
Basil and mint both land around 1.9-2.1× on the ROI table. They’re not bad investments, but the math isn’t as compelling as the top three.
Basil suffers from a yield problem: 0.5 lb per plant per season is the figure most extension services use for planning, and it’s accurate for a conservatively managed plant. A well-managed plant that is pinched aggressively and harvested repeatedly can push 1.0-1.5 lb (this is what the body text in the basil page notes). If you’re hitting 1.0 lb per plant, basil’s ROI multiple rises to 4.3× - more competitive with cilantro. The key word is “well-managed.” Most home gardeners don’t pinch aggressively enough, let plants bolt prematurely, and end up with the conservative 0.5 lb estimate.
The high retail price ($14.99/lb) is basil’s saving grace in this comparison. At $15/lb for organic loose basil at a specialty grocer, even a modest harvest pays back the seed cost. And basil seed costs pennies per plant when started from a packet - the $3.50 figure reflects a transplant or commercial plant, not a seed-start.
Mint presents a special case: the $4.00 start cost reflects a potted plant purchase, which is the right way to start mint. Growing peppermint or spearmint from seed is possible but slow. Once established, a mint plant spreads aggressively and the “per plant” model breaks down - you’ll have far more than one plant by year two. The yield and value in the table understates what an established mint planting produces. The real ROI argument for mint is the indefinite production once established: after year one, your ongoing input cost is zero, and a contained bed of mint produces 2-4 lb of harvestable leaf per season per square foot.
The Perennials: Where Year-One Math Fails
Thyme and chives look bad in the table. Thyme breaks even. Chives runs negative. Neither conclusion is a reason to avoid them.
Thyme (Thymus vulgaris) yields 0.25 lb of usable leaf per plant in year one - small because the plant is establishing. By year two, a well-grown thyme plant yields 0.4-0.6 lb per season and doesn’t require replanting. In year three and beyond, the plant expands and yields increase. A $2.99 investment in year one produces herb for 5-10 years with zero ongoing seed cost. Penn State Extension documents common thyme as reliably perennial in zones 4-9 with minimal winter protection needed.
The year-one ROI of 1.0× is essentially a one-year payback period - you get your $2.99 back in year one and everything after that is free production. That’s not a bad deal for a perennial. The table metric, ROI multiple, just doesn’t capture the multi-year value.
Chives (Allium schoenoprasum) is the one entry in this table that shows a negative first-year return (-$0.49 net). This is accurate and worth acknowledging. A single new chives planting produces very little leaf in its first season. The plant is establishing; it doesn’t reach full production until year two or three. The chives page on this site shows the multi-year compounding: by year three with 3-6 clumps from divisions, annual value reaches $6-8. By year five, cumulative value from one $2.49 packet exceeds $28.
Planting chives for the year-one numbers will disappoint you. Planting them because you want a permanent, low-maintenance allium herb that provides flavoring year after year and divides freely into more plants - that’s the actual case.
Rosemary (Salvia rosmarinus, formerly Rosmarinus officinalis) sits at 1.7× in year one. The same logic applies: rosemary is a perennial in zones 7-11. In colder zones, it needs winter protection or is treated as an annual. For zone 7+ gardeners, the $3.49 plant investment provides 10+ years of production. For zone 5-6 gardeners treating it as an annual, 1.7× ROI is the complete picture.
What This Table Doesn’t Show
Three things the ROI multiple misses:
Usage rate matters more than ROI multiple. Dill at 5.5× is only a good investment if you actually use 2.0 lb of dill per season. If you use one small bunch per year, buying that at the store is more rational than growing a succession of dill plants. The herb that delivers the highest real-world return is the herb you use enough of to justify the harvest.
Quality gap varies. The retail comparison implicitly assumes store-bought and home-grown are equivalent products. For basil, they’re not: fresh-cut basil from your garden has a flavor intensity that store basil - harvested days ago, refrigerated, typically bruised in the package - can’t match. For parsley, the gap is smaller. For dill, it’s significant. The quality premium is real but unquantifiable in a table.
Kitchen proximity saves money separately. A tablespoon of fresh thyme at the right moment costs you nothing when the plant is five feet from your kitchen door. Without it, the alternative isn’t buying fresh thyme - it’s substituting dried thyme at $8-20/oz or omitting it from the dish. That daily utility doesn’t show up in the yield-and-price calculation.
Practical Recommendations
If you have room for three herb beds:
- Annual bed: cilantro (succession throughout spring and fall), dill (succession throughout spring and summer), basil (full sun, heat; transplant after last frost)
- Biennial/long-season bed: flat-leaf parsley (plant once, harvest into the second year before it bolts)
- Perennial bed: chives + thyme + rosemary (plant once, maintain indefinitely; this is the highest long-term ROI per square foot once established)
The annual bed gives you the highest first-year return per dollar invested. The perennial bed gives you the lowest first-year return and the highest lifetime return. Both are worth having.
Less common culinary herbs carry even higher retail premiums than those in the table above. Shiso (Japanese perilla) sells for $8-15/lb at Asian grocery stores and is rarely available at conventional supermarkets. Chervil - a mild anise-flavored herb common in French cooking - commands $10-18/lb at specialty grocers. Marjoram and winter savory occupy a similar premium niche, both retailing at $10-16/lb where available. Lemon verbena and bay laurel are perennials that, once established, provide free harvests for years.
Crop pages: Basil - Cilantro - Parsley - Dill - Mint - Thyme - Oregano - Chives
Related reading: Seeds vs Transplants - cost comparison for starting herbs from seed versus buying starts; Medicinal Herb Garden - valerian, echinacea, and the crops where medicinal value compounds the ROI case; Grow Lights Cost Analysis - whether indoor herb production under lights pencils out; Microgreens ROI - fastest-turn herbs and greens grown as microgreens