Quince, or japonica, is a flowering shrub that reaches heights of 6 feet or more. It has dense, deep green foliage for most of the summer, but in spring it blooms with striking red flowers. Quince also produces small fruits that when harvested in fall are used to make preserves. Flowering quince is often propagated by seed. Purchased seeds are usually ready for immediate planting. If you collect your own seed, it requires some preparation before it will germinate.
Stratify gathered seeds eight weeks before sowing. Fill a plastic bag with moist peat moss or potting mix. Place the seeds inside the bag and seal shut. Place in a refrigerator or 40-degree Fahrenheit room for two months.
Fill a 6-inch diameter pot with equal parts sand, peat moss and compost. Mix together and water until it is evenly moist throughout.
Sow the seed to a depth twice its width. Place the pot in a plastic bag to retain moisture while it germinates.
Place the pot in a sunny window or under grow lights for 12 hours a day. Remove the bag once the seeds germinates, approximately 21 to 28 days after sowing. Check the soil once a week and water if it begins to dry out.
Transplant the quince outdoors once all danger of frost has passed in spring. Choose a well-drained area that receives full sunlight as the permanent home of the quince.