The following legend describes the codes for each listing:

 

  Penstemon utahensis (Scrophulariaceae)(36x15, Z4, P, RGL, 3:8w) ......... 40 seeds / $4.00
      Name                           Family                 (a)     (b)  (c)  (d)    (e)

               (a) Height x Width:    

Zone 1:       < -50º F.

  approximate size                 (b) Zone 2:    -50º to -40º
  at maturity, in     Zone 3:    -40º to -30º
  centimeters   Zone Rating:

Zone 4:    -30º to -20º

        Zone 5:    -20º to -10º
        Zone 6:    -10º to    0º
        Zone 7:        0º to  10º
        Zone 8:      10º to  20º
               (c) (P)erennial     Zone 9:      20º to  30º
  (A)nnual     Zone 10:    30º to  40º
  (B)iennial     Zone 11:     > 40º F.

 

    (d) Seed Pre-Treatment:
(L)ight is required or seed is so tiny that it should not be buried.
(S)carify seed by rubbing lightly on sandpaper or nick seed coat.

(C)over seed to a depth of about 4 times the minimum seed dimension.  (This is not a strict rule: most seeds have ambivalent light requirements and may be surface sown regardless of size.  Those needing darkness will be so stated in the individual descriptions.)

(R)ub vigorously between hands to remove impermeable seed coat or fuzz, etc., which may prevent water imbibition or cause seed rot.

(E)dgewise: seed is flat and wide — insert seed in sowing medium to stand on edge.
(G)ibberelic Acid (GA3) treatment helpful in stimulating germination.

(W)ater treatment: germination takes place under water.

Note: More than one letter may be applicable.

 

     (e) Germination Codes:
(1)  No cold stratification necessary: germination is usually complete within a month or less.

(2)  No cold stratification necessary: germination may be staggered over several weeks.  Flushes may occur at intervals, especially if the sowing medium is allowed to dry out gradually and then re-wetted.

(3) Cold stratification required for the number of weeks indicated, followed by exposure to warmth, after which germination is usually complete within a month or less.

(4) Cold stratification required for the number of weeks indicated, followed by exposure to warmth, after which germination may be staggered over several weeks.  Another period of cold may be helpful to encourage remaining seeds to sprout.  Alternatively, seed may be exposed to outdoor winter conditions for germination in the spring.

(5) Warm, moist stratification required for 3 to 4 months, followed by 2 to 3 months cold stratification during which germination takes place while cold.  Expose to warmth when germination is complete.

(6) Germination of fern spores — sterilize soil medium with boiling water, sow spores and keep moist with plastic or glass.  A green film (prothalli) develops in several weeks, followed by baby ferns which can be transplanted when big enough to handle.

 

(7) Germination of orchid seeds requires specialized equipment -- consult a reference.

 

 

87817.44 (example Collection Number) (W) wild-collected seeds -- County, State (or Country) and approx. elevation in feet and/or meters.  JRT numbers refer to Thompson field collections. TC numbers refer to Thompson cultured collections.