You can also judge the ripeness of the Marijuana by taking a look at the trichomes; or little hairs/crystals on the flowers and surrounding areas of the Marijuana plant. If they are transparent its still too soon, if they are milky white they are ready and if they turn brown they have become over-ripe. It is also advisable to follow the instructions to harvest Marijuana seeds on the packet since most reputable breeders also have a tried and tested flowering time for optimum ripeness, potency and flavour of a Marijuana strain.
After the whole process of germination, growth and flowering, a lot of growers ask themselves when to harvest Marijuana seeds. Usually, the breeders will include a suggested flowering time for each strain, but as a rule of thumb, Indica marijuana plants harvest in 6-8 weeks while Sativa Marijuana plants take 10-12 weeks.
If you meant when to harvest seeds from cross-pollinated Marijuana plants, then the seed will fall from the flower by itself once it is mature and ready to germinate into another Marijuana plant. Usually, as a best practice to harvest Marijuana seeds, some growers wait for the whole flowering cycle to end just as if they were harvesting the flower.
Look for these signs for when to harvest Marijuana seeds
You might find our FAQ Submission How Do I Harvest My Plant? useful
Remember, never go near female plants after harvesting pollen or having been near any flowering male plants. Also do not keep your male plants in close proximity to your female plants or you’ll risk pollinating them and destroying your harvest.
When it comes to storing cannabis pollen, moisture is your worst enemy; if your pollen gets wet it is literally useless.
HOW TO COLLECT CANNABIS POLLEN FROM MALE PLANTS?
Pollen is usually collected by expert breeders and used to make cannabis seeds or breed unique strains. It can be manually extracted from flowering male plants and stored for well over a year.
This pollen plays an important role in breeding as it allows expert breeders to mix and match the genetics from different plant varieties to create their own cannabis seeds of their own strains.
Collecting pollen is relatively simple. You’ll know your male plants are ready when their pollen sacks look full or when you find small patches of pollen on nearby leafs.