- Name: Youth On Age - Other Common Names: Thousand Mothers / Piggyback Plant - Scientific Name: Tolmiea Menziesii - Color: Reddish Purple - Plant Seeds: Best Fall Sown - Bloom Time: Spring - Hardiness Zone: 6 - 9 - Plant Height: 12 - 18" - Plant Spacing: 18 - 24" - Light Requirements: Shade - Soil Water Preferences: Average - Moist - Quantity: 100 Seeds - Other: Youth On Age Is Native To The Western Us Canada, Is Grown Primarily As An Ornamental. The Plants Have A Neat Mounding Habit, Are Named For Their New Leaves That Sprout Up In The Center Of The Mature Leaves. The Plants Like Moisture Humidity, Can Be Grown Outdoors As A Ground Cover Or Indoors As A House Plant. While The Tubular Flowers Are Small, They Are Plentiful On Spikes, Are Very Lovely Up Close!