How can I tell if plants are long- or short-day?

bcakeDecember 14, 2011

I'm performing a research to see if artificial light from street lamps affects the growth and shedding of plant leaves.

In order for me to discuss my results I have to know if these plants are long-day or short-day plants.

The way I understand it from having researched, my plants are long-day plants as they are blooming in the spring when there is more than ~6hrs of sun per day.

But is bloom time only when actual flowers bloom or can it be when the leaves sprout? The way I see it it's when the plants comes out of dormancy, whether that be in the spring or in the fall. But trees such as a few varieties of Oak defy this as their flowers grow prior to their leaves. It really confuses me as to what can be called long-day plant.

The plants in question are:

Species 1. Lilac - Syringa vulgaris.

s.2. Cherry - Prunus avium

s.3. Maple - Crimson King

s.4. Spiraea

s.6 Sycamore

s.8 London Plane

s.10 Hawthorn - Crataegus sp.

s.12 Willow - Salix sp.

Thank you for reporting this comment. Undo
TheMasterGardener1(5B)

Long days!! I think!

Cherry like peach is a long day that needs that cold part of the year.

I would like to see your results, please post them. ;)

    Bookmark   December 22, 2011 at 12:48AM
Sign Up to comment
More Discussions
Lots of seeds - Please help me get started (Zone 6A)
I went a little overboard with a couple of seed orders...
oldbat2be
coleus cuttings
Some of my fall coleus cuttings are growing bigger...
maryjozone5
New to Forum - some questions, comments about heating mats
I have been starting flower seeds indoors for years...
snapdrag
Having problems with seedlings this year
I have been starting seeds under lights for about 10...
wendeyzee
grow spot light
If i use a really low beam angle led grow light can...
surixurient
Sponsored Products
Yellow Frangipani Silk Flowers and Ceramic Vase
Overstock.com
Jaipur Metro Mecara Area Rug - RUG112651
$62.00 | Hayneedle
Old Dutch Positivity Teapot
Overstock.com
Outdoor Lighting. Twin Head Bird of Paradise Bronze Solar LED Path Light
$29.97 | Home Depot
Jade Sedona Red Professional Yoga Mat - 368R
$62.95 | Hayneedle
The Wallflowers - Set of 3
| Dot & Bo
Safavieh Indoor/Outdoor Area Rug: Safavieh Rugs Bohemian Gold/Multi 3 ft. x 5
Home Depot
Safavieh Indoor/Outdoor Area Rug: Safavieh Rugs Organic Black / Natural 2 ft. 6
$99.97 | Home Depot
People viewed this after searching for:
© 2015 Houzz Inc. Houzz® The new way to design your home™