Do not plant the seeds or seedlings under extremely temperature. Temperature below 15-degree celcius or above 30-degree celcius normally guarantees a poor result. 2. Stratification is not necessary if the seeds are very fresh (e.G. Just harvested in season). Germination rate decreases longer the seeds is stored. Thus, if you are unsure how long your seeds has been stored, treatment of stratification is highly recommended. Steps for stratification: 1. Rinse the sakura (cherry blossom) seeds gently in a sieve. 2. Use gardening gloves and soak the sakura (cherry blossom) seeds into the 10% hydrogen peroxide solution for about 10 minutes. This step is optional but it helps prevent possible molding drastically. 3. Pick up the seeds with a pair of tweezers and put them into a moist kitchen paper, then put them into a zip loc bag. Finish by labeling them and then refrigerate them. (do not put into a freezer. Let them stay in the lower part of a refrigerator - the part where you usually store vegetables or fruit will be fine.) 4. Sprouting should start in 2-8 weeks, depending on the variety. Some variety takes up to months to start germination. Check for germination once a week and if necessary ,moisturize the kitchen paper to maintain humidity.
