We’re deep into fall and gardening is winding down, but there are still things gardeners wonder about. If you’ve got questions, turn to Ask an Expert, an online question-and-answer tool from Oregon State University’s Extension Service. OSU Extension faculty and Master Gardeners reply to queries within two business days, usually less. To ask a question, simply go to the OSU Extension website and type in a question and the county where you live. Here are some questions asked by other gardeners. What’s yours?
Q: My ‘Fuyu’ persimmon that’s approximately 8 feet tall was planted in February 2020 and bore fruit this fall. I had about 25 persimmons on the tree but they did not get very big (about 2 inches across). Are they small because it was the tree’s first year in the ground? Should I have thinned the fruit in early summer? Also, only a few turned yellowish before the weather turned sub-freezing last night. I harvested half before the freeze and will take the remainder today, and hope these all ripen in the house. – Washington County
A: The smaller than normal size of the ‘Fuyu’ persimmons is more than likely due to a heavy fruit set on a very young tree.
The usual recommendation for fruit trees is to remove all fruits for the first 3 years. The reason is that it’s wise to allow plenty of time for the tree to develop a sturdy root system so that the tree is able to support abundant yields for many years. With fruits in place early on, the tree’s energies are diverted from root growth and re-directed to the fruits.
For the next several years, consider removing all fruits that set, thereby helping the tree develop its root system.
Fortunately, frost helps accelerate maturation of Asian persimmons. The catch, though, is that the fruits must already have begun to color up.
See this persimmon fact sheet. – Jean Natter, OSU Extension Master Gardener Diagnostician
Damaged potatoOSU Extension Service
Q: Both our ‘Red Norland’ and ‘Yuko Gem’ potatoes were affected by whatever this is. Please help us identify the problem, and how to eliminate it for next year. – Curry County
A: Your question was an interesting one that sent me on a fairly deep dive. Normally, I would have thought that such damage was due to some sort of disease, but in taking a closer look and viewing lots of sites, it appears that the flea beetle may be the cause. You can find some good photos closely matching the pictures you sent here. You will also find an approach for managing them here or in this publication on organic methods of control. – Scott Thiemann, Master Gardener program assistant
Hazelnut tree, also known as a filbert tree. Photo courtesy of OSU Extension Service
Q: Can you prune ‘Jefferson’ filbert early fall after harvest with the leaves still on? – Linn County
A: Jefferson hazelnuts (filberts) have probably dropped most of their leaves, or will soon. An advantage of waiting for leaf drop is to see tree structure well and have leaves remain in the orchard as mulch. Here’s some more information about pruning filberts. – Jacki Dougan, Master Gardener Diagnostician
When's the best time to fertilize a lawn? Ask an expert.OSU Extension Service
Q: I’m up at about 1000 feet out of northwest Portland. The south slope of my lawn was mulched, seeded and sprinkled with “new grass” fertilizer fairly late but is already a couple of inches high. I’d like to get as much growth out of it as possible, more root growth to hold the ground in place during the winter rains. Would scattering more fertilizer on the new grass now be a good idea when we can be sure that the weather will be getting colder? I’m tempted and am looking for an informed opinion. – Multnomah County
A: Your lawn may not need any fertilizer at all, but certainly not now. I suggest you read this OSU Extension article to evaluate the options. – Kris LaMar, OSU Extension Master Gardener
Tulip bulbs can still be put in the ground this fall. File photo
Q: We’re a little behind in our planting, so I was wondering if it is too late to plant flower bulbs in Newberg. We have tulips and fritillaria. – Yamhill County
A: It is not too late. As long as the ground is not frozen you may plant those bulbs for a colorful display in spring. – Anna Ashby, OSU Extension Master Gardener
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