Plum tomato (Roma)

Plum tomato (Roma): plant 50 cm (20 in) apart in the row and 70 cm (28 in) between rows, 1 per square. Good neighbours: Garlic chives, Basil, Carrot.

Key facts

Spacing in the row	50 cm (20 in)
Between rows	70 cm (28 in)
In a 30 cm (1 ft) square	1 per square
Sun	Full sun, 6–8 hours a day
Root depth	40 cm (16 in)
Height when grown	120 cm (47 in)
Crop rotation group	Potato and tomato family
Support	Needs a stake or cage

Sowing and germination

How it is started	Started in trays
Seeds per hole	2
Plants kept after thinning	1
Sowing depth	0.6 cm (0.2 in)
Soil temperature	from 10 °C, best 18–29 °C
Days to emerge	6–14 days
Light while germinating	Light makes no difference
Before sowing	nothing needed
When to plant	Indoors 6 weeks before the last frost; outdoors after the last frost; soil at least 15 °C

From seedling to plant

After emergence	18–24 °C; take the cover off as soon as they show
Pricking out	at 2 true leaves
Takes transplanting	Only with care, keep the root ball
Hardening off	7–10 days
Life cycle	Annual
Cold tolerance	Tender, hurt by frost
Soil	Rich, with compost, free draining, pH 5.5–7
In a pot	15 L, 35 cm (13.8 in)
Watering	Water when the soil is dry two fingers down; at flowering, while fruit sets
Feeding	Hungry; at planting, at flowering, while picking
Support and training	A stake; remove the side shoots, tie in as it grows

Harvest and planning

Days to first harvest	70–85 days, from planting out
Ready when	The fruit has its full colour
Harvest window	Picked again and again, 6–10 weeks
Typical yield	3–5 kg per plant
Botanical family	Solanaceae
Watch out for	Aphids, whitefly, blight

Good neighbours

◐ good with a condition · Why, with the sources →

Keep away from

Potato

Plan Plum tomato (Roma) in your garden

Open the free planner, drop Plum tomato (Roma) onto a bed and see how many plants fit.

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Sowing and harvest

Sow indoors	Mar–Apr
Plant out	May
Harvest	Aug–Oct

My dates for this crop

My country Last spring frost where I live

Give the date once and this page, the sowing calendar and the planner all follow it.

Months for a temperate climate: about a month later in the north and a month earlier in the south. Give your own last frost date for exact dates.

What to plant next to Plum tomato (Roma) →

From the same family

Plants of the Solanaceae family share diseases and pests, so they follow each other in the rotation only after a break.

Grown much the same way

Crops that need about the same room and care, from another family.

Sources

The values on this page marked as checked come from these sources: spacing, sowing depth, germination, soil, timing and safety notes, each against the source named here.

Growing tomatoes in home gardens (reviewed 2024) — University of Minnesota Extension for: sowing depth, soil, when to sow, scientific name, spacing in the row; checked 2026-10-29
Soil Temperature Conditions for Vegetable Seed Germination (GN 154, after J.F. Harrington, UC Davis) — UC Cooperative Extension, UC ANR for: days to emerge, soil temperature; checked 2026-10-30
Soil Temperature Conditions for Vegetable Seed Germination (ANR-1061, 2023) — Alabama Cooperative Extension System for: soil temperature; checked 2026-10-29
Soil Temperature and Field Vegetable Germination — Alberta Agriculture and Forestry for: days to emerge; checked 2026-10-29

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