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Rubus parviflorus

Thimbleberry

Family RosaceaeGenus Rubus

Three domed berries of tightly packed pink drupelets, one already deep red, sitting in ragged calyces against a broad crinkled leaf.
FruitWalter Siegmund (talk)CC BY-SA 3.0

About the plant

What it is and where it grows — not part of any germination protocol.

The plant

Habit
subshrubPlants of the World Online
Habit
Perennial, SubshrubPLANTS Database
Height
4.0 ft1.2 mPLANTS Database
Flower
WhitePLANTS Database
Blooms
SpringPLANTS Database
Native range
Alaska, Canada, lower 48 statesPLANTS Database

Growing conditions

Sun
Shade tolerance: MediumPLANTS Database
Soil
Adapted to medium, fine textured soilsPLANTS Database
Soil pH
4.8-7.2PLANTS Database
Moisture
Moisture use: HighPLANTS Database
Watering
Drought tolerance: MediumPLANTS Database

Toxicity is noted only where a source states it. No note here is not a finding of safety.

Sources: Plants of the World Online — Royal Botanic Gardens, Kew; PLANTS Database — USDA NRCS.

Worth knowing

This source reports two treatments. Both are shown.

Protocol 1

DerivedN. C. Deno, 1993

Difficulty High Rated by us, not by the source.

Start around February 15, 2027 for a May 3 last frost.

  1. Gibberellic acid soak

  2. Sow and cover

    Temperature: 70°F 21°C

No stated waiting before sowing. Then 49 days to germinate.

25% germination in 28–49 days.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Rubus p. 207Public domain
Show the original text
Rubus (Rosaceae). A. parviflorus germ. 70 GA-3(25% in 4-7 w), 70D(none), and 40-70D(6%). Eugene Zielinski communicated that it germ. in April in outdoor treatment.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Rubus p. 207. Quoted exactly. Every value on this card comes from this record, except the difficulty rating, which is ours; the step names come from a fixed list.

Protocol 2

DerivedN. C. Deno, 1993

Difficulty Very high Rated by us, not by the source.

Start around December 15, 2026 for a May 3 last frost.

  1. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

  2. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C Light: dark

about 3 months from start to step 2. Germination happens during step 2; time not stated, 21 days assumed.

6% germination.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Rubus p. 207Public domain
Show the original text
Rubus (Rosaceae). A. parviflorus germ. 70 GA-3(25% in 4-7 w), 70D(none), and 40-70D(6%). Eugene Zielinski communicated that it germ. in April in outdoor treatment.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Rubus p. 207. Quoted exactly. Every value on this card comes from this record, except the difficulty rating, which is ours; the step names come from a fixed list.

How each step is done, in Deno’s words, and what Verified and Derived mean.

Germination trials

Readers’ own records of sowing this species, published after review. Share your trial · All trials

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