Potted hydrangea are a great addition to any home as they are fragrant and beautiful. One very fascinating fact about potted hydrangea (with exception of white ones) is that for the most part the average person can manipulate the color of the flowers. While it is important to note that you cannot necessarily control the brilliance of the colors you can have a little fun with your garden and change the color every year. This article gives a few quick tips on how to turn your blue hydrangea pink.
1). Add dolomitic lime to the soil every few months. Since hydrangea bushes absorb aluminum at lower PH levels better you will want to keep the PH of your soil at about 6.0 to 6.2 (any higher and you risk iron deficiencies and other problems). The use of dolomitic lime every few months can really help to keep the PH level in your soil to a growth environment ideal for pink blooms. Before you start adding anything to your soil though it is very important to test your soil for the correct PH levels. You can get soil testing kits from any home improvement center as well the dolomitic lime that you may need.
2). Use a fertilizing spray that contains low levels of phosphorus. Phosphorus in the right amount actually helps to inhibit the absorption of aluminum by your hydrangeas. Try a fertilizing spray that is a close ratio to 25/10/10 (phosphorus being the middle number). This will help to keep any aluminum that made its way into your soil from being absorbed by the plant’s root system. Be sure to be careful how much phosphorus is in the fertilizer though as phosphorus in large amounts can be toxic to the plant. Also, be careful not to over fertilize as this could damage your plant as well. Make sure to read the back of the bag for instructions on how often to fertilize.
3). Repot the Plant in Neutral Soil. The main ingredient for blue hydrangea flowers is aluminum. Having your hydrangeas potted in soil that is alkaline or neutral soil where the absorption of aluminum is inhibited is a must for all pink blooms. You can repot the plant in order to achieve an alkaline or neutral soil and some people find it easier. However, if you choose to do this be careful of which potting soil you use as most have a low PH level with high levels of aluminum. Before you start adding lots of potting soil though, go ahead and check the soil in your lawn. Many places typically have higher PH levels with lower aluminum levels you may not need to add anything at all just dig up a little dirt from your lawn. Once the desired PH level is reached (about 6.0 to 6.2) you will need to check or soil every month or two to make sure that your soil is staying neutral.
Pink hydrangea are beautiful and a great summery color. In some places where the weather is typically milder you may even end up with red flowers. Once you test your soil and have the ideal growing soil you will be able to show off your DIY color changing skills to all your friends and family.
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