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Tomato Seeds - Indeterminate - Carbon Beefsteak

Dark, smoky-flavored beefsteak with complex sweetness and rich color.
Sustainability features Details
1-Year Warranty
Non-GMO / BE Policy Details
seeds / pkt

Description

The Carbon Tomato is an award-winning black beefsteak variety prized for its rich, smoky-sweet flavor and velvety texture. Maturing in 85–90 days, this indeterminate tomato produces large, 10–12 oz fruits with deep purple-brown skin and dark red flesh.

Its complex taste—sweet yet earthy with notes of wine and spice—makes it a standout for slicing, salads, and gourmet cooking. The meaty interior holds few seeds, making each bite dense and satisfying.

Plants are vigorous and heat-tolerant, performing best in full sun with consistent watering and fertile soil. Provide sturdy staking for its tall vines and heavy fruit set. Originally selected for its remarkable flavor depth, Carbon is often regarded as one of the finest-tasting dark heirlooms available.

$200 USD $500
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Minimum Seed Count
25
Soil pH
6.0–6.5
Soil Type
Loamy
Sunlight
Full sun
Plant Spacing
36 in
Row Spacing
36 in
Support
Stake
Ideal Soil Temp
70–85°F
Seed Depth
1/4 in
Sprouts in
7-14 Day
Life Cycle
Annual
Growth Habit
Indeterminate
Frost Hardy
Tender
Scientific Name
Solanum lycopersicum
Maturity
80-89 Days (from transplant)
Grow Location
Container, Garden Plot, Raised Bed, Vertical Gardening, Greenhouse, Community Garden
Non-GMO Safe Seed Pledge

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Estimated delivery
Deliver to United States
Checking local suitability…
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Average Last Frost
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Average First Frost

From Seed Indoors (Spring)

Start:

From Plant (Spring)

Transplant:

Expected Harvest

Window:

Is this a good fit for your garden?

Answer the checklist to see your fit
Sunlight
Tip: More sun = sweeter fruit. Dappled shade lowers yield.
Water access
Keep evenly moist; deep, infrequent soaks reduce blossom-end rot.
Space
Season length
Set your ZIP above to auto-check this for you.
Soil & temperature
Mulch moderates swings; wait for warm soil to avoid transplant shock.

Shipped from U.S.A.

Our seeds are grown and sourced from the US. They're then packed and shipped from Colerain NC.

Triple tested

We regularly test the quality and germination rate of our seeds. We're so confident that our seeds are backed by a 1 year warranty!

Soil Readiness

for Tomato Plants (Solanum lycopersicum)

Where to get a soil test

Best option: your state’s Cooperative Extension soil testing lab.

Tip: Arid/alkaline regions (e.g., AZ, NM, UT, parts of CA) often use Olsen (bicarbonate) for phosphorus.
Adjusts P (ppm) target & interpretation.
Target 6.2–6.8
Ideal 4–8%
Target 40–60 ppm (Mehlich-3)
Target 150–200 ppm
Ok ≥ 1000 ppm
Ok ≥ 120 ppm
For pH adjustment size
For “shopping list” amounts
Interprets P by extractant; assumes ppm. Results are approximate.
Enter at least one value above, then Calculate.

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