Purple Cannabis Seeds

Why Do Some Cannabis Strains Turn Purple?

The purple, violet and sometimes reddish colours seen in cannabis come largely from pigments called anthocyanins. These naturally occurring plant pigments are present in many species and can become particularly visible in cannabis varieties with the right genetic background.

Genetics are therefore the starting point. Some strains have a much stronger tendency to develop purple pigmentation than others, which is why we've brought together genetics specifically known for producing these colours in this collection. If you want to understand the genetics and growing conditions behind the colour in more detail, our guide to how to turn weed purple takes a closer look at what actually influences purple pigmentation.

Are Purple Cannabis Plants Always Purple?

No. Even when you're growing genetics known for purple colouration, the exact appearance can vary. Different plants can express pigmentation to different degrees, and environmental conditions can influence how visible those colours become.

That means we'd never treat a purple seed as a guarantee that every plant will finish with exactly the same shade or intensity. Good purple genetics increase the potential for those characteristics to appear, but you're still growing a living plant rather than reproducing an identical colour from seed.

Does Cold Weather Make Cannabis Turn Purple?

Cooler temperatures, particularly during flowering, can encourage purple pigmentation to become more noticeable in genetically predisposed plants. This is one reason growers sometimes associate colder conditions with purple cannabis.

Temperature alone isn't enough to turn any cannabis strain purple, however. The genetics need to have the potential to express those pigments in the first place. We also wouldn't recommend deliberately exposing plants to unhealthy temperature extremes purely to chase a darker colour, as maintaining healthy growing conditions is more important than appearance.

Can Cannabis Flowers and Leaves Both Turn Purple?

Yes. Depending on the strain, purple pigmentation can appear in different parts of the plant. Some genetics develop purple and violet shades predominantly in the flowers, while others can show considerable colour across the surrounding leaves and other plant tissue as flowering progresses.

The shade can vary too. Purple cannabis isn't limited to one particular colour, and individual plants can show combinations of violet, lavender, deep purple, red and occasionally almost black-looking pigmentation. Purple isn't the only distinctive colour found in cannabis either, so you can also explore our blue cannabis seeds and white cannabis seeds if appearance is an important part of what you want to grow.

Does Purple Cannabis Mean Higher THC?

No. Purple colour isn't an indication of THC content or potency. Anthocyanin pigmentation and cannabinoid production are different characteristics, so a deeply purple plant isn't automatically stronger than a green one.

You'll find purple strains with different THC levels throughout this collection. If maximum potency matters more to you than colour, we'd recommend comparing the THC figures for individual varieties or exploring our high THC cannabis seeds.

What Are Purple Cannabis Strains Like to Grow?

There isn't one growing pattern shared by every purple strain. Purple describes a visual characteristic rather than a particular plant type, so this collection can include indica, sativa and hybrid genetics with very different heights, structures and flowering times.

We'd recommend choosing the strain based on how well its overall characteristics suit your grow rather than colour alone. Check expected height, flowering time, yield and difficulty to grow alongside the appearance you're hoping to achieve.

Choosing the Right Purple Cannabis Seeds

If colour is your main reason for exploring this collection, start by looking at how individual strains typically express their purple characteristics. Some are known for particularly dark flowers, while others produce more subtle colour across the flowers and surrounding leaves.

From there, we'd choose exactly as we would with any other cannabis strain. Consider the plant's size, flowering time, potency, effects, expected yield and difficulty to grow. If you want to start with one of the best-known names in purple cannabis, Granddaddy Purple is a classic example, known for the deep purple colours that helped make these genetics so recognisable.

Purple Cannabis Seeds FAQs

What makes cannabis plants turn purple?

Purple colouration is primarily associated with plant pigments called anthocyanins. Genetics determine whether a cannabis plant has a strong tendency to express these colours, while growing conditions can influence how strongly the pigmentation appears.

Will every purple cannabis seed produce a purple plant?

Not necessarily. Seeds from purple genetics have the potential to develop purple pigmentation, but the intensity can vary between individual plants and growing environments. We wouldn't guarantee that every seed will produce exactly the same colour expression.

Do purple cannabis plants need cold temperatures?

No. Genetics are the most important starting point. Cooler temperatures can encourage pigmentation in some genetically predisposed strains, but you don't need to expose plants to excessively cold conditions to grow purple cannabis.

Is purple cannabis stronger than green cannabis?

No. Purple pigmentation doesn't tell you how potent a strain is. THC content depends on the genetics and cannabinoid profile of the individual strain, so we'd recommend checking its specifications rather than using colour as an indication of strength.

Can autoflower cannabis plants turn purple?

Yes. Purple pigmentation isn't limited to photoperiod cannabis. Autoflower genetics can also produce purple flowers and foliage when the appropriate colour traits have been incorporated into the strain.