Gear · Seeds
Seeds — buying the cultivar, not the vegetable
A packet costs five dollars and decides everything downstream. Which specific cultivars the sauces on this site are built on, and why substituting is not a small change.
Seeds The cultivar decides the sauce. Everything downstream is damage control.
The cheapest decision in the whole pipeline is also the most consequential. Five dollars of seed, chosen in January, determines what is possible in September. No amount of feeding, watering or technique turns a beefsteak into a paste tomato.
Where cultivar genuinely matters
Paste tomato, not slicer. A beefsteak is roughly 94% water with a large seed cavity. Reduce it and you spend three hours boiling water off and end up with something thin. San Marzano and Roma have thick walls, small cavities and more pectin. This is not a preference — it halves your cooking time and doubles the body.
Genovese basil, not any basil. Genovese is high in linalool and eugenol and low in estragole. Thai basil is the reverse, which is why it tastes of anise. Substituting is not a downgrade; it is a different sauce.
Tomatillo, not green tomato. A tomatillo is a Physalis — around pH 3.8 with its own pectin. A green tomato is pH 4.2–4.4 with none. That difference is both a flavour difference and an acid-safety difference in anything you preserve.
Serrano, not jalapeño, for verde. Three to five times the heat with a cleaner green flavour that sits alongside tomatillo rather than muddying it.
Marconi, not bell, for romesco. Long and thin-walled: it chars evenly and the skin lifts off in one piece. A bell fights you and collapses.
Determinate versus indeterminate
Worth understanding before you buy a tomato packet.
- Determinate (Roma): sets a terminal cluster, ripens most of the crop in about three weeks, finishes. One sauce day.
- Indeterminate (San Marzano): grows and fruits until frost. Multiple batches, more support, more season.
Neither is better. Determinate suits short seasons and single big canning days; indeterminate suits long seasons and steady production.
Long-day versus short-day onions
Onions bulb on photoperiod, not on age or size. A long-day onion grown below about 36° N never receives its trigger and simply never bulbs — beautiful tops, no onion. Get this one right for your latitude or the crop is a write-off no matter what you do.
Seed garlic, not grocery garlic
Supermarket garlic is often treated with a sprout inhibitor and is usually a softneck variety unsuited to cold winters. Seed garlic is untreated and sold by variety. Hardneck gives larger, easier-peeling cloves and June scapes; softneck stores longer and braids.
Practical notes
- Buy fresh. Pepper seed loses viability noticeably after two to three years; onion seed after one.
- Buy packet scale. You need six habanero plants, not six hundred seeds.
- Buy in January. Specific cultivars sell out, and a packet that arrives in April has already cost you the season.
- Heirloom / open-pollinated lets you save seed. Hybrids will not come true from saved seed.
The picks
Sow Right Seeds
Habanero Orange Pepper Seed
$4.94
The workhorse superhot for sauce: 100,000–350,000 SHU with a genuine apricot-floral top note that survives fermentation. Nothing else in this range tastes like fruit instead of pure burn.
Why this one
- Capsicum chinense — the fruity species, not the flat heat of an annuum
- 90–100 days from transplant, so it fits a Zone 5 season if you start on time
- Packet-scale quantity: you need six plants, not six hundred seeds
The tradeoff
- Germinates slowly and sulks below 80 °F soil — a heat mat is not optional for this one
- Superhot seed is worth starting 10 weeks out, not 8
Sow Right Seeds
Jalapeño Pepper Seed
$4.94
The one you smoke into chipotle. Left on the plant to red and corked, then cold-smoked, a jalapeño stops being a taco garnish and becomes the backbone of an adobo.
Why this one
- 70–75 days green, ~85 to full red — the red stage is where chipotle comes from
- Reliable germination and heavy set even in a 7-gallon pot
- 2,500–8,000 SHU: enough heat to matter, low enough to eat by the spoonful
The tradeoff
- Green-picking constantly is what keeps yield up; leave fruit to red and total yield drops
Sow Right Seeds
Serrano Pepper Seed
$4.90
Cleaner and greener than a jalapeño at roughly three times the heat. The correct chile for salsa verde and zhoug, where you want brightness rather than smoke.
Why this one
- 10,000–23,000 SHU — hot enough to carry a green sauce without a superhot's fruit
- Thin walls mean it blends smooth without peeling
- Extremely productive: one plant carries 40+ pods
The tradeoff
- Thin walls also mean it does not dry or freeze as well as thicker chiles
The Old Farmer's Almanac
Organic Cayenne (Long Slim) Seed
$4.49
The long, thin, wall-thin cayenne that dries in a week and grinds to a clean red powder. If you want flakes and powder as well as sauce, this is the plant that does both.
Why this one
- 30,000–50,000 SHU, straightforward heat with no smoke or fruit competing
- Thin walls dry fast — the single most dehydrator-friendly chile here
- USDA-certified organic seed
The tradeoff
- Approximately 30 seeds per packet — buy two if you're planting a row
Sow Right Seeds
Marconi Red Sweet Pepper Seed
$4.94
A long Italian sweet pepper that roasts and peels far better than a bell. Romesco and any red-pepper paste wants this, not a supermarket bell.
Why this one
- Thin-shouldered and long — it chars evenly and the skin slips off in one piece
- Sweeter than a bell when fully red, with real depth after roasting
- 80 days to red
The tradeoff
- Needs the full run to red; picked green it is just a mediocre bell
- Very few reviews on this listing — it is a newer packet from an established seed house
Sow Right Seeds
San Marzano Tomato Seed
$4.94
The paste tomato Italian canners actually use. Low seed cavity, low water, high pectin: it reduces to a sauce in half the time a slicer takes and never tastes thin.
Why this one
- Indeterminate — it keeps setting fruit until frost, which is what a multi-batch season needs
- Dense flesh, few seeds, thick walls: less time boiling water out of your sauce
- 80 days from transplant
The tradeoff
- Indeterminate means real staking or caging, not a tomato ring
- Prone to blossom end rot in containers if watering swings — that is a calcium-uptake problem, not a calcium-deficiency one
RDR Seeds
Roma Tomato Seed (300+)
$5.99
The determinate paste tomato: it ripens most of its crop inside a three-week window. That is a liability for eating and an enormous advantage for sauce day.
Why this one
- Determinate — a concentrated harvest is exactly what a canning batch wants
- 75 days, faster than San Marzano, so it fits shorter seasons
- 300+ seeds means enough to succession-sow for two batches
The tradeoff
- Determinate also means the plant is finished after that window; it will not carry you to frost
Sow Right Seeds
Toma Verde Tomatillo Seed
$4.94
Salsa verde is not a green tomato sauce — it is a tomatillo sauce, and the difference is the tartness and the natural pectin that makes it cling. There is no substitute.
Why this one
- 60–70 days, one of the fastest fruit crops on this site
- Naturally acidic (pH ~3.8 raw), which does real work in a preserved sauce
- Enormously productive — 60+ fruit per plant is normal
The tradeoff
- Tomatillos are self-incompatible: ONE plant sets almost nothing. You must grow at least two.
Sow Right Seeds
Genovese Sweet Basil Seed
$4.94
The large-leaf, low-anise Italian basil that pesto is defined by. Thai and lemon basils are good plants and wrong ingredients.
Why this one
- Broad, soft leaves — high leaf mass per plant, which is what a cup of pesto needs
- 60 days, and you cut from it all season
- 2,000+ seeds: succession-sow every three weeks and never run out
The tradeoff
- Bolts in heat. Pinching flower spikes weekly is the entire job of growing basil well.
Sow Right Seeds
Cilantro / Coriander Seed
$4.94
Bolts in a heartbeat and there is nothing you can do about it — so you succession-sow instead of fighting it. Non-negotiable in salsa verde and zhoug.
Why this one
- Direct-sown, 45 days to usable leaf
- Cheap enough per packet to sow every two weeks all season
- Bolted plants give you coriander seed, which is a second ingredient, not a failure
The tradeoff
- Transplants poorly — it has a taproot. Sow where it will grow.
- Will bolt in 3 weeks above 75 °F no matter what the packet says
Sow Right Seeds
Yellow Sweet Spanish Onion Seed
$4.94
A long-day storage onion with enough sugar to sweat down without scorching. The aromatic base under every tomato sauce on this site.
Why this one
- Grown from seed, not sets — better storage life and no bolting from a stressed set
- 110 days, so it goes in earlier than anything else here
- Sweet enough to caramelize rather than just soften
The tradeoff
- Long-day: correct above roughly 36° N latitude, wrong in the deep South
- Needs a 10–12 week indoor head start, the earliest sow on the whole calendar
Sow Right Seeds
Scarlet Nantes Carrot Seed
$4.94
The carrot that makes a fermented habanero sauce work. It brings sweetness and body so the sauce has texture without thickener and heat without being one-dimensional.
Why this one
- Coreless and sweet — no woody centre to strain out
- 70 days, direct sown, no transplant step
- Blends completely smooth, which a fibrous carrot will not
The tradeoff
- Wants loose, stone-free soil at least 8 inches deep; heavy clay gives you forked carrots
- Slow, erratic germination — keep the surface damp for two full weeks
Garlic Bulb
Siberian Hardneck Seed Garlic, 1 lb
$15.29
Planted in October, pulled in July. Hardneck garlic has bigger, easier-peeling cloves and gives you scapes in June — a free second crop that is itself excellent in green sauce.
Why this one
- Hardneck: larger cloves, stronger flavour, and edible scapes
- Seed garlic, not grocery garlic — untreated and grown for planting
- Siberian is a reliable, cold-hardy porcelain type
The tradeoff
- Planted in autumn for the FOLLOWING summer. It is the one crop on this site that is a year ahead of everything else.
- Poor keeper compared to softneck — use it within 6 months
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