Tony2. It might be more helpful with a bit more information. Your profile indicates a zone 8 area but I am wondering more about your temperatures and humidity levels as well as plant location. The plant symptoms definitely are not virus or insect related in my opinion. The leaf edge burn would indicate a possible high heat and low humidity situation. The ability of the plants root system to supply enough water to the outer extreme leaf edges is the result but not necessarily the cause. The leaf edges are the last to receive moisture and nutrients within the plant. Possibly the plants are growing in an area that may be receiving reflected heat from surroundings. This does not mean you are not watering sufficiently but for some reason the plantÂs ability to take up the water is being limited. Plants growing in a restricted area sometimes produce root-bound conditions that might contribute to this occurrence. High transpirations rates are compounded by high temp and low humidity conditions. Burning leaf tips or edges would be a possible consequence. Excessive fertilization can potentially cause tender feeder roots to burn and limit the nutrient uptake. You may be looking at either a root problem or plant location problem or a combination of both. Hope this is helpful. Regards, Kent

Brown leaf edges often indicate leaf scorch, something that can happen when a plants roots cannot supply sufficient moisture for the leaves to transpire. http://www.missouribotanicalgarden.org/gardens-gardening/your-garden/help-for-the-home-gardener/advice-tips-resources/pests-and-problems/environmental/scorch.aspx kimmq is kimmsr

I'm no expert and not aware of your current weather. If it were my plant I would water the rose very well. Unless the soil is already moist. Then check to see how far down the watering went. Mulch the rose if you can afford to do so. If temps are 70 degrees or above and sunny try to provide some shade in the afternoon while your little rose recovers. No fertilizers or pesticides the plant is stressed at the moment. Just give it time too recover. Shade good be an old lawn chair. I've even used a workhorse with an old towel over the top. If windy weight down with a brick or something.

how are you applying the fert.. and are you doing it in sun ... looks like fert may have washed down the leaf.. and puddled at leaf ends.. and maybe got burned ... i dont see any doom.. and i surely see no reason to destroy it all ... petunia need to be cut back a couple times during the season... when they start getting leggy ... i see no reason to do it too soon.. just because of a few brown leaf tips ... i also wonder about a cold event.. since you admit you planted too early ... and a minor cold snap.. may have caused what you see .. and its just showing now .... it never hurts to tell us where you are .. big city name ... zone alone is not good enough ... water when the pot needs water ... which in cool spring should not be very often ... you might be overwatering ... insert finger.. and FIND OUT ... and water when it needs it ... come the heat of summer.. more water will probably be needed ... but not right now ... also.. i see some seed pods forming.. you need to deadhead the pet's frequently ... to keep bloom going... ken