The Purps Auto
Stunning Purple Beauty in 10 Weeks
The Purps Auto is one of the most visually stunning cannabis strains you can grow. BC Bud Depot took their award-winning Purps genetics and crossed them with ruderalis to create an autoflowering version that produces breathtaking deep purple and violet buds in just 10 weeks from seed. The grape and berry aroma is intoxicating, and the relaxing, happy high makes it perfect for social occasions and creative pursuits. Its compact size and beginner-friendly nature make it an ideal choice for first-time growers who want impressive results without the complexity.
19%
1%
7–8 weeks
Medium
60–90 cm
Beginner
Relaxing, Happy, Creative
Grape, Berry, Floral
How to Grow The Purps Auto
Everything you need to know to grow The Purps Auto successfully — from seed to harvest.
Pro Tips
- Cool night temperatures (15–18°C) dramatically intensify the purple colouration
- Gentle LST only — no topping autoflowers to preserve the fixed life cycle
- The purple pigmentation is genetic — it will appear regardless of temperature, but cold nights enhance it
- Grape and berry terpenes peak when harvested at the right time — don't rush
- Use a jeweller's loupe to check trichomes — milky white = peak effect
- Dry slowly in a cool, dark space to preserve the stunning purple colour in the final product
Indoor Growing
- Perfect for small tents — stays under 90cm indoors
- LED lights with a full spectrum enhance purple pigment expression
- Expect 80–150g per plant indoors
- Multiple harvests per year — 4–5 cycles possible annually
Outdoor Growing
- The natural cool nights of Canadian autumn enhance purple colouration outdoors
- Perfect for balcony grows — compact and discreet
- Harvest in late August to September for outdoor Canadian grows
- Outdoor yields of 80–150g per plant
Grow Timeline
Germination
2–4 days
Direct sow in final container. Avoid transplanting autoflowers.
Seedling
1–2 weeks
Compact seedling with indica leaf structure. Green at this stage.
Vegetative
2–3 weeks
Short veg phase. Apply gentle LST. Pre-flowers appear early.
Flowering
7–8 weeks
Purple pigments develop progressively. Most intense colour in final 2 weeks.
Harvest
Day 63–70
Total 9–10 weeks from seed. Harvest when trichomes are milky white.
Common Issues & Fixes
Buds not turning purple
Drop night temperatures to 15°C. Purple is genetic but enhanced by cold. Also check you have the right strain.
Small yield
Increase light intensity and hours to 20/4. Ensure adequate root space (3–5 gallon pot).
Overwatering (drooping leaves)
Allow soil to dry completely between waterings. Lift pot to gauge moisture by weight.
Premature harvest (weak effect)
Wait for milky trichomes. The Purps Auto builds potency in the final 2 weeks.
Set Up Your Grow with Mars Hydro
Get the LED grow lights, grow tents, and complete kits you need to grow The Purps Auto indoors. Trusted by home growers across Canada.
Shop Mars Hydro CanadaThe Purps Auto Nutrient Guide
Week-by-week feeding recommendations to maximize yield and potency.
Week 1–2
SeedlingVery light feeding. Start at 20% of recommended dose for autoflowers.
Week 3–4
Veg / Pre-flowerGentle veg nutrients. Watch for early pistils — transition happens fast.
Week 5–6
Early FlowerBloom nutrients. Purple pigments begin developing. Add anthocyanin-supporting nutrients.
Week 7–8
Peak FlowerMaximum bud development. Purple colouration intensifies. PK booster optional.
Week 9
FlushFlush for 5–7 days. Enhances grape and berry flavour in the final product.
Note: NPK values are relative percentages of maximum recommended dose, not absolute measurements. Always follow your specific nutrient brand's guidelines and adjust based on plant response.
Ready to Grow The Purps Auto?
Get your seeds from BC Bud Depot — backed by an 80% germination guarantee and discreet worldwide shipping.
Affiliate Disclosure: Elixir Sue may earn a commission when you purchase through links on this page. This helps support our content at no extra cost to you.
You Might Also Like
Crop King Seeds
Northern Lights Auto
A classic indica autoflower perfect for small spaces. Fast, forgiving, and deeply relaxing.
Rocket Seeds
Gorilla Glue Auto
One of the most potent autoflowers available. Sticky, resinous buds with a heavy, relaxing effect.
BC Bud Depot
BC God Bud
BC Bud Depot's most iconic strain. A heavy indica with tropical fruit aromas and a deeply sedating body high.