Ever wonder why you buy perennials in the spring and they just sit there for a month or two before they start growing? Most of the time, we blame it on “culture shock” or “transplanting” or any number of other cultural things.
Plant Growth Regulators
Many nurseries use a plant growth regulators (PGR) to slow growth down so the plants don’t leap out of the pots.
And trust me, this was a problem in our nursery as the plants would leap out and start growing at the hint of spring. We had all kinds of spacing activities to keep them all growing, yet bushy and looking good for retail sales. (We didn’t use PGR’s)
But the kicker in this is most common growth regulators last 8-12 weeks and in the spring, instead of growing like crazy, the plant grows bushy and shorter. Again, it makes a better selling plant.
But that chemical still persists and is acting when you take the plant home. It stays short and bushy and really doesn’t get growing “normally”. Or as normally as it would if you did it at home.
You get a bushier plant. But one that’s slower to begin growing strongly.
That’s one effect of a Plant Growth Hormone Regulator (PGR)
And now you know why some of your new plants might not jump right into growing when you first plant them.
p.s. the effects of PGR typically disappear at 8-12 weeks so after that, growth should be normal. So figure 4-6 weeks in the nursery and 4-6 weeks at your garden. If it isn’t growing after 4-6 weeks in your garden, then you may have other issues.