Nasturtium

'Red Wonder' single red/orange flower, reddish-green leaf, and interesting accent plant
‘Dwarf Tip Top Mix’ high quality, top flowering variety with loads of blooms over neat foliage in mixed colors

Nemesia

fruticans (caerulea)
Perennial.  A fragrant addition to any garden, these plants fill the air with a sweet vanilla scent. The flowers resemble a miniature Snapdragon, on tiny light green leaves.  Usually evergreen, they will make a beautiful pot plant or addition to the front border. Full sun to part sun. Height to 12”. Zones 8-10
'antiriniflora'  Lilac flowers
'Blue Bird' deep purple-blue flowers with yellow throat, a very popular selection, excellent performer, heat tolerant
‘Candy Girl’ pink flowers, well behaved growth habit, sweet candy fragrance
'Compact Innocence' White flowers, shorter
'Confetti' Pink flowers
'Innocence' White flowers, very fragrant, popular
‘Lavender’ lavender flowers, fragrant, compact habit
‘Trail Blazer’ pink trailing
‘variegated’ pink flowers, compact upright habit, variegated foliage
‘Aromatica Series’ flowers better in warm temps than other varieties
‘Dark Lavender’
‘Lavender P
‘Sachet Series' Fragrant and showy with trumpet-shaped blooms. Compact, 6” Excellent for spring, in lavender (pale lavender) Blueberry, Peach, & Vanilla (pale Cream)
strumosa Annual. This plant is a staple for the front border. It is available in many colors and sure to please any palate. The compact mounding habit is very pleasing. Full sun. Height 8-12". 
'Aegean Sea' Blue with white speckles.
'Blue Gem' Bright blue
'Danish Flag' Red/ white bicolor
'KLM' top petals blue, lower petals creamy white, yellow throat
'Nebula' Series Large flowers in rose or mixed colors
‘Sundrops Mix’ widest color range, gold, rose, red shades, and white in a variety of patterns. Compact

Nemophila 

‘Penny Black’ Annual nearly black flowers with a narrow white edge, 6” high
atamaria ‘Snowstorm’ Annual, sophisticated pure white flowers delicately speckled in black to 6” tall

Nepeta

nervosa      Catmint
Perennial. The spreading habit of this plant makes it ideal for the middle of any perennial garden.  It has tiny clear blue flowers on erect stems.  Bees and cats love it!  Full sun to part shade.  Height 12-14" Zones 5-9
nervosa ‘Blue Carpet’ Blooms the first year with nice mid blue flowers. Plants grow 14" tall and produce any stems. Masses of violet-blue flowers over an extended time in summer that makes this plants a valuable addition to the sunny border. Were happy - in well-drained open soils - they will self-seed. This selection is short enough to use as an edging too. Zones (4) 5-8

Nicotiana           

Flowering Tobacco Zones 7-10 ‘Hummingbird Series’dwarf, 10-12” high, you can space them 10” apart in a landscape and they’ll create a solid block of color. Hummingbirds love them as well.
‘Appleblossom’
‘Cherry Blossom’
‘Lemon Lime’
‘Lilac’
‘Merlin Mix’ compact 8” variety, performs in sun or rain, available in crimson, lime, peach, purple, rose, salmon, & white

Nierembergia

scoparia Perennial.  A mid-sized selection of Cupflower, this plant makes a nice addition to the perennial border or patio planter.  It has large blue flowers over fine foliage, peaking in the summer months. It is an Athens Select heat tolerant plant.  Full sun.  Height 14-18". Zones 8-10
‘Athens Powder Blue'
‘Fairy Bells Blue’ compact trailing habit
‘Fairy Bells White’ compact trailing habit
‘Robe Series’
‘Purple Robe’ rich violet blue, 6” to 12”
‘Robe White’ white, 6” to 12”
‘White Rose’

Nolana

nautical Found in Chile, Peru, and the Galapagos Islands, long tube or bell shaped flowers singly or in clusters develop in the leaf axils near the stem tips and appear throughout the growing season. Nolana prefer humus rich well drained soil in sun or part shade. Pinch to keep bushy. Zones 9-10
‘Dark Blue’ mounded, trailing, well branched plants, loaded with petunia like blooms, good for baskets and containers
‘Light Blue’ mounded, trailing, well branched plants, loaded with petunia like blooms, good for baskets and containers

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"O"

Oenothera

speciosa Evening Primrose Perennial. Pink flowers bloom continuously through the summer on this creeping plant. The stems and lance shaped leaves have a red-purple tinge in hot weather. It is a tough, drought tolerant, heat loving plant and will fit in any California garden. Do not over water once established. Full sun to part sun.  Height to 12", trails to 18". Zones 5-10
berlandii  (O. speciosa chidsii) Mexican Primrose Light pink cup shaped flowers top narrow, toothed leaves. The stems have an arching habit. Ht.6-12"
‘Siskiyou Pink’ a selected form with bright pink flowers.

Omhalodes

cappadocica ‘Parisian Skies’ blooms earlier and more profusely than Corydalis. Rich blue flowers literally cover the plant in mid-spring. Spread is 10”, height 5” Zones 6-9

Omphalodes

linifolia 'Hails in Spain' Annual. This charming little plant will brighten any shady corner of the garden. After flowering the tiny white petals are sprinkled around the garden, followed by unusual seedpods. Will naturalize in the landscape Part sun/part shade. 6-9". 

Osteospermum           

African Daisy These tough, evergreen plants will thrive in tough, hot, and dry conditions once established. The large leaves have a rough texture, and the daisy flowers are prolific in the spring and summer.  Dimorphotheca is more upright and Osteospermum is more trailing.  However Osteospermum will take on a slightly upright, bushy appearance as it matures. Full sun. Height 12-15" Zones 8-10
‘Springstar Series’ compact growth, ever-blooming, 10” to 13” tall
‘Arctur’ White flowers, blue center
‘Aurora’ huge magenta blooms
‘Capella’ large white bloom with dark center
‘Mira' Dark pink/magenta
‘Sirius' Medium pink
‘Symphony Series’
'Cream Symphony' Cream, purple eye
'Lemon Symphony'Lemon yellow, purple eye
‘Orange Symphony’ creamy orange
‘Side Series’
‘Brightside’ white with blue center
‘Highside’ rose/white bicolor w/blue center
‘Riverside’ yellow with white center
‘Seaside’ pink/white bicolor with blue center
‘Wildside’ dark purple with blue center

Other Osteospermum available:

'Cannington Roy' White w/purple, pink reverse
'Giles Gilby' Purple flowers, leaves have a gold stripe down the center, 16”-24” tall, 24”-36” wide
‘Painted Purple’ variegated foliage and purple flowers
'Purple Blush' Huge white flowers with a purple blush and a purple circle around the golden yellow center are displayed elegantly on long stems over compact foliage. This heat tolerant daisy is perfect for beds, planters and baskets.
'Silver Sparkler' White, variegated leaf
‘Vanilla Cream’ Creamy yellow

Oxalis

crassipes ‘alba’ a sterile variety that blooms non-stop until frost. Sun and drought tolerant with mounding apple green leaves and profuse, bright white flowers. Spread 7”, height 5” with flowers to 10”
‘vulcanicola Sunset Yellow’ red leaves and stems topped with glowing yellow flowers, full sun Zones 9-10