japanese roses, portulaca or rose moss are diffrent in name but same plant. its a tough little plant but if you neglect it, the stem will become woody and wilt.
i start growing this moss about 2 years ago as ground cover. i found it very attractive in 3 months then the flower getting smaller and gone. living in heat and drought area make the moss suffer.
about one year ago i try to breed new japanese rose that can bloom from morning till dust. since i had trouble to get rid slug, i plant it on hanging pot. growing in full sun .with more attention my moss still living in same pot. giving a lot of flower. i water it ones a day and fertilizer twice a month. i find watering is important to have longer living moss. japanese rose use water and plant food to get energy to produce flower and busheir stem.
i think to change its name to cat flower because its loyal he he he....