Do you want to grow sunflower in Pennsylvania , but do n’t know when to plant them ?
Planting sunflower is not as easy as it seems .
Here ’s why :

So if you plant them out of doors too early in the spring they will perish . And if you plant them too recently , your helianthus wo n’t produce a efflorescence .
Today , I ’m break to instruct you the ideal time to set sunflower in Pennsylvania :
When to Plant Sunflower in Pennsylvania
As you may have already guessed , you demand to pay up very skinny attention to your local weather in the spring . Specifically , you are going to need to watch when the last frost come .
In worldwide , when there has n’t been a frost for two weeks , you are SAFE to plant your sunflower outside in Pennsylvania !
For your cite , I have created this board for median icing date for most major city in Pennsylvania . If your urban center is not listed below you could find its Last & First Frost DatesHERE .

Pennsylvania Last & First Frost Dates
Unfortunately , Mother Nature play cruel tricks on us every year .
It should be noted that the above dates are just averages .
There are class when the last Robert Lee Frost comesMUCHlater . Sometimes , the last Robert Frost happens much earlier and you’re able to get your sunflower planted outside in Pennsylvania much faster .

Like I said before , you need to be very diligent in checking your local weather .
So what find if a icing comes AFTER you imbed your sunflower ?
When you know a frost is come you need to take action .
Also , make indisputable not to engraft your helianthus in your garden too late .
When Should You Start Your Sunflower Seeds Indoors?
reckon on the type of sunflower , it accept about 10 to 14 days to turn sunflower from seed indoors and then transfer them to your garden . And then another 12 to 18 weeks to bloom !
For aspecific datethat you should start sunflower seed indoors you should :
Not only this , but I recommend again paying tightlipped aid to your local weather report .
It should also be noted that the beneficial technique for get your sunflower plants out of doors is to usher in them ( in their pots ) outside for an hour . And then increase the amount of time they spend outside each twenty-four hour period by an hour until they have been out of doors for 8 hours .
This will “ harden ” your sunflower plant life , increasing its chance of fighting off diseases , worm , droughts , and wet condition .
If you want to learnWHENto plantANYFlower in Pennsylvania , manoeuvre over toHEREand just eccentric in the flower you require to produce .