Do you desire to grow macrocosm in Oklahoma , but do n’t screw when to plant them ?
Planting world is not as wanton as it seems .
Here ’s why :

So if you implant them outside too early in the natural spring they will die . And if you plant them too latterly , your cosmos wo n’t produce a bloom .
Today , I ’m going to instruct you the idealistic fourth dimension to plant universe in Oklahoma :
When to Plant Cosmos in Oklahoma
As you may have already opine , you need to pay very close aid to your local weather in the spring . Specifically , you are going to postulate to watch when the last Robert Frost occurs .
In ecumenical , when there has n’t been a frost for two weeks , you are SAFE to plant your cosmos outside in Oklahoma !
For your mention , I have created this table for average frost dates for most major city in Oklahoma . If your city is not listed below you could find its Last & First Frost DatesHERE .

Oklahoma Last & First Frost Dates
regrettably , Mother Nature plays cruel tricks on us every year .
It should be noted that the above day of the month are just averages .
There are years when the last hoarfrost comesMUCHlater . Sometimes , the last frost happens much in the beginning and you may get your cosmea planted outside in Oklahoma much quicker .

Like I enounce before , you need to be very diligent in checking your local weather .
So what encounter if a frost get AFTER you plant your cosmea ?
When you know a hoarfrost is total you need to take activity .
Also , ensure not to constitute your creation in your garden too late .
When Should You Start Your Cosmos Seeds Indoors?
Depending on the eccentric of cosmos , it takes around 7 to 10 twenty-four hour period to grow creation from seed indoors and then transplant them to your garden . And then another 3 month to bloom !
For aspecific datethat you should start cosmos seeds indoors you should :
Not only this , but I recommend again paying close attention to your local conditions report card .
It should also be noted that the best proficiency for bring in your cosmos plants alfresco is to introduce them ( in their slew ) out of doors for an hour . And then increase the amount of time they spend outside each day by an hour until they have been outside for 8 hour .
This will “ indurate ” your cosmos industrial plant , increase its chances of struggle off disease , dirt ball , droughts , and besotted conditions .
If you want to learnWHENto plantANYFlower in Oklahoma , head over toHEREand just character in the blossom you want to grow .