Seeds for big outdoor plants.

Filters we used, and why

• Feminized: every seed grows into a female plant, the one that flowers, so you don't need to spot and remove males. Feminized or regular.
• Photoperiod: it flowers when the nights get longer, so outdoors it grows all summer and flowers in autumn. Autoflower or photoperiod.
• Height tall: 160 cm or more as stated. Height brackets.
• Yield high: 600 g/m² or more as stated.

Why photoperiods grow big outdoors

A photoperiod plant keeps growing as long as the days are long. Planted outside in late spring, it grows through June and July and starts flowering only when the nights get longer in late summer. That long growing season is what makes a large plant and a large harvest possible. An autoflower flowers by age and stays smaller.

What the filters say

Filter	Bracket	Why
Feminized	Nearly all female	Every plant you give space to makes buds
Photoperiod	Flowers by day length	The whole summer to grow
Height tall	160 cm or more as stated	Built to grow big
Yield high	600 g/m² or more as stated	Built to produce a lot

A seed with no stated height or yield sits in the middle bracket and isn't shown here. Grow specs.

Before you choose: three checks

1. Is your summer long enough?

Tall, high-yielding plants are often sativa-leaning and flower longer. In a short northern summer, a long flowering time can mean harvesting in October rain. Check each seed's flowering time, or look at fast-flowering seeds for a short summer.

Your summer	Flowering time to look for
Short (UK, Netherlands, Canada)	Short: under 56 days
Average (central Europe)	Short or average
Long (south Europe)	Any

2. Do you have the space?

A big outdoor plant can grow 2 metres tall and almost as wide. Give it full sun for most of the day, a large pot or open ground, and room for air to move around it.

3. Can you keep it out of sight?

A tall plant is easy to see over a fence. If that matters, drop the tall filter and keep the plant lower by bending its branches outward as it grows.

Getting a big harvest

The genetics set the ceiling; the season decides how close you get.

• Start early: sprout indoors in April and plant out after the last frost.
• Big root space: the bigger the pot or bed, the bigger the plant.
• Sun: at least six hours of direct sun a day, more is better.
• Water and feed: a large plant drinks a lot in July and August.
• Mould watch: large, dense buds hold water after rain. Check them from September.

Breeders describe their best plants, grown in the best summers. Read the figures as a direction.

Compare prices

Outdoor growers often sow a few extra seeds to allow for losses. A large pack (10 to 25 seeds) is often cheaper per seed. Bigger packs, cheaper seeds.

Make it yours

• Drop tall: high-yielding photoperiods of any height.
• Short summer? Fast-flowering photoperiods.

Good to know

Breeders describe their best results. Your light, feeding, weather and harvest decide what you actually get, so read every figure as a direction.

Filters like high, short, small and easy only show seeds where a breeder or shop states that figure. A seed with no figure sits in the middle bracket, so it isn't shown here even if it would fit. No figure? The middle bracket.