Pea shoots / Pea tendrils (Pisum sativum) growing guide

Quick facts

Category: leafy greens
Difficulty: beginner
Days to harvest: 14 to 25 days
Harvest type: cut leaves, plant regrows for repeated harvests
Spacing: 5 cm between plants

Environment

Temperature: 10–22°C
pH: 6 to 7
EC (hydroponic): 0.8 to 1.6 mS/cm
Daily light: 10 to 15 mol/m²/day

Climate and zones

USDA zones: 3 to 9 (winter low around -40°C or warmer)
Frost tolerance: frost hardy (handles regular frost)
Season: cool (spring and fall crops)

Viable growing environments:

outdoor year-round (in zone)
outdoor in growing season (annual)
unheated greenhouse / hoop house
heated greenhouse
indoor (heated home)
indoor hydroponics under grow lights

USDA zone bounds reflect outdoor year-round survival. Anywhere outside the bounded zone range, this crop still grows as an annual in the warm months (outdoor_seasonal), under cover (greenhouse), or indoors under lights.

Growing systems

Pea shoots works in:

deep water culture (rafts)
NFT channels
media bed (ebb and flow)
wicking bed
soil bed

Growing media

The substrate the roots sit in. Choice depends on the system (clay pebbles don't fit NFT channels; rockwool isn't used in media beds) and the crop (pea shoots works in the media listed below).

Medium	pH effect	Water retention	Bacterial surface
Rockwool (Mineral wool)	alkaline until pre-soaked	very high	low
Expanded clay pebbles (LECA)	neutral / inert	low	high
Coco coir (Coconut coir)	slightly acidic	high	moderate
Net pot, no medium (Bare-root)	-	-	-
Soil-based mix (Potting soil)	varies by source	high	high

Bacterial surface area matters for aquaponics: clay pebbles, lava rock, and pumice double as biofilter substrate. Low-surface media (rockwool, perlite, pea gravel) work in hydroponics but need a separate biofilter in aquaponics.

Nutrient demand by stage

NPK ratios are relative weights at each growth stage; the nutrient mix calculator scales them to absolute grams or ml. EC targets shift through the plant's life: seedlings need a much lighter solution than fruiting adults.

Stage	N	P	K	EC target (mS/cm)
seedling	1	1	1	0.6
vegetative	2	1	2	1.2

Aquaponics suitability

Compatible with typical aquaponics nutrient profiles. Fish waste provides enough nitrogen for healthy growth; supplemental potassium, calcium, and iron may still be needed depending on fish stocking density.

Care notes

One of the fastest and most rewarding hydroponic crops. For microgreens: soak seeds overnight, spread densely on a growing pad (hemp, coir), keep moist in darkness for 2-3 days, then expose to light. Harvest at 7-14 days when tendrils emerge. For full-sized shoots: EC 1.0-2.0 mS/cm, pH 6.0-7.0, temperature 12–22°C (cool-season; heat above 25°C makes shoots tough and bitter). Moderate light (DLI 12-18 mol/m2/day). NFT, DWC, or Kratky systems. From seed to shoot harvest: 3-4 weeks. Cut the top 10–15 cm of each vine; the plant regrows and produces a second (sometimes third) harvest, though each successive cutting is thinner. Succession plant every 2 weeks for continuous supply. The sweet, fresh pea flavor is most intense in cool-grown shoots. Pea shoots are one of the highest-value microgreens/greens per square meter: fast turnover, high demand, premium pricing ($15-30/kg retail), and minimal pest or disease issues. A top-tier hydroponic specialty crop.

Notable varieties

A starting shortlist of cultivars worth knowing about. Not exhaustive: the seed catalogs list hundreds of named varieties. These are the ones home growers commonly choose between.

Cultivar	Type	Days	Notes
Dwarf Grey Sugar	heirloom	20	Pre-1892 heirloom, the classic pea-shoot variety. Purple-blushed stems and tendrils, mild sweet flavor. Vines stay short which is fine since you're not letting them climb. Holds tenderness longer than modern peas after cutting.
Speckled (Capucijner)	heirloom	18	Dutch heirloom with mottled brown-purple seeds and bold purple stems on the shoots. Stronger pea flavor and visual punch in salad mixes. Distinct from the green-seed types, worth growing alongside them for color.
Oregon Sugar Pod II	open-pollinated	20	Modern Oregon State University release. Heavy tendril production from each shoot, the trait you want for stir-fries where tendrils are the prize. Resistant to pea enation mosaic, useful if the bed has had peas in it recently.