Description Speaker Knockerz Feminized Strain has a high production, with 450g/m² indoors and 100g per plant outdoors. It grows thick, tight buds with white frosty trichomes and a sticky surface and the chance of purple colours. The strain is also disease-resistant, giving it a secure option for gardeners. Speaker Knockerz Feminized Cannabis Seeds can be found at Crop King Seeds. Cultivation Speaker Knockerz feminized strain seeds grow best in a Mediterranean climate. It typically grows between 5 to 8 feet tall indoors and outdoors. This strain does well in warm and sunny weather and flowers in 7 to 8 weeks. You can expect yield of up to 450 grams per square meter indoors and close to 100 grams per plant outdoors.