Black Widow — Full Grow Diary

Welcome to one of my favourite runs to date — Black Widow from Nirvana Seeds. She is a legendary old-school cross with a serious reputation for resin, and this grow comes with a little bit of a mystery attached too. Let us get into it. 🕷️

The Black Widow backstory

Here is the thing a lot of growers do not realise: “Black Widow” and “White Widow” share a tangled family tree, and over the years the names have been crossed, renamed and rebranded so many times that telling them apart is half the fun. Digging into the real history of this strain — same genetics, different name, different breeder — is exactly the kind of rabbit hole I love. I break the full story down on the channel, but for this diary, what matters is she grows like an absolute champion.

Week 1 — The Great Reset

Every great grow starts with a clean slate. I reset the tent, ran fresh soil and popped the Black Widow girls into their fabric pots. Within the first 7 days the seedlings were up, open and reaching — strong, even and no stretch. Nine plants in, all looking happy.

Week 2 — Into veg

Week two is where the personality starts showing. The girls thickened up, the internodes stayed tight and that classic wide indica leaf came through. Steady feeds, good airflow, and a bio neem routine to keep everything clean — no drama, just growth.

Week 3 — Filling the tent

By week three the canopy is really starting to come together. Plenty of new growth, deep green colour and strong stems ready for a bit of training. From here it is all about shaping the canopy and getting these girls primed for flower.

🧬 Grown from Black Widow — Nirvana Genetics.

Weeks 1–4 in Flower — She Made It Through

Since that last update the girls went through the mite war — catch the full blow-by-blow in the Mite War posts if you have not already — but the short version is Black Widow came out the other side clean, got the flip to 12/12, and has not looked back since.

Four weeks into flower now and the canopy is doing exactly what a Black Widow should — dense, frosty, and building fast. I pulled a real VPD reading straight from the tent this round too, logged and tracked in GrowLegend the same as every feed and watering before it, so I can actually see whether the room is dialled in rather than just guessing.

Full breakdown — Week 1 through Week 4, the real VPD reading, and how it is all logged — watch the full update on the channel now.

Watch the full grow series

The complete Black Widow grow, episode by episode on my YouTube channel:

▶ ▶ Watch the full Black Widow playlist on YouTube