The D.C. Seed Exchange

Welcome to the D.C. Seed Exchange! We are a small seed bank focused on the highest quality genetics. Our mission is to build a virtual trading space that features genetics from the best breeders in North America as well as highlighting local talent from the Mid-Atlantic region. Below is a complete list of our vendors offering a variety of regular, feminized and auto-flowering seeds.

We are here to help, if you have any questions please don't hesitate to contact us!


Star Pupil S1 (Thai x Afghan) 7 Feminized Seeds

(2 customer reviews)


Earn 89 points upon purchasing this product.

10 in stock


Star Pupil is MMS most famous strain, and the plant that got us all started as world renowned breeders. A result of crossing genetics from seeds gifted by a friend, with supposed Thai/Afghan/Pakistan genetics (recently confirmed correct by Phylos), this plant stood out superbly, even in veg. She turned out to be the exact plant we were hoping for, and was named Star Pupil. Little did we know, Star Pupil would stick with us forever. Notable mentions are High Times Flower of the Month in January 2017. She is a very unique purple strain, and even makes people who “dont like purple weed” often change their minds!
As a plant, these are grown from Feminized seed. They are extremely consistent, stable, even as a Feminized variety. They like a little longer initial vegetative time from seed, and grow excellent and easy from clone. Best results when branches are spread out with stakes or netting. She is a unique plant and does better when watered less often.
Flower time is 9 weeks. Stretch is medium, taller than a short indica but nothing extreme like a pure sativa. She will approximately double in size upon onset of flower, depending on environmental conditions (light spectrum and intensity, temperature, etc.) Flowers are fully purple from the start of flower under any temperatures, no cold needed for her to put on a show! Purple trichomes are common, and in cold her buds can actually go fully black in color! If temperatures are very hot, over 95 degrees, she may show hints of green along with the purples. The buds can be pressed fresh into purple rosin as well and have massive bag appeal.
Her sativa genes invoke a powerful mental high. This bud has an incredible, unique flavor that comes out best in a joint, vape, or dab and can be described as perfume, grape, heavy, ‘purple’, skunky and thick.
7 Feminized Seeds plus freebies!

2 reviews for Star Pupil S1 (Thai x Afghan) 7 Feminized Seeds

  1. Andrew (verified owner)

    Just what you would expect from Mass Med’a flagship strain. Consistent, purple flowers with a great aroma and better effects. Dont sleep on these!

  2. Chris (verified owner)

    I was excited to try this Strain especially after growing one of Mass Med’s last year with great results. This Run was not what i expect for top dollar seed. Germination was 5 out of 7 seeds and one had some mild mutations and was discarded after five weeks. I gave three of the plants to friends and we all had the same experience in three different location. Plant initially grew well through Veg. Once it was half way through flowering it slowed down and did not pack weight on or “Chunk out”. The plant finished and looked nice however yield was low. After curing and tring the flower it is a nice smoke, very mild and seems closer to a 1:1 ratio then a medium to High THC plant. bottom line for ending up with 4 plants at the expense of $120 with a low yield and mild smoke I would not buy this strain again. I would try another Mass Med, but for the time and effort that go’s into bring a plant to fruition I’ll stick with the breeder who I know and have had great results with.

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