Peter’s Gardening Tips for April 2020

Despite the challenging times we face due to the Coronavirus pandemic, some of us have been enjoying some wonderfully warm and sunny spring weather, and the gardens have been responding to all this glorious sunlight.  

Garden with care though as frosts can still be possible as the night time temperatures are still very low.

If you are lucky enough to have a garden to enjoy, there is much to do right now, it’s a challenge to know where to begin … here are my top tips for this month:


Perk up your lawn with a feed, weed and moss killer.  Aerating the lawn is a must after winter.  This can be done by standing on a fork in a lawn and gently pulling back on the fork – not breaking the handle!  The ground will lift a bit and crack the surface so improving drainage and critically getting more air to the roots of the grass. Alternatively, you could invest in a pair of Lawn Aerating Sandals. This will help the grass to grow and reduce moss and algae.  If your lawn is large forget doing the above by hand or foot and hire a Lawn Aerating machine, either with solid tines or a slitting machine.  After scarifying or aerating, any bare patches can be over-seeded with new grass seed lightly covered with fresh soil, and keep watered.  If the whole lawn is looking thin, then over-seed the whole area,  one handful of seed to the square yard/metre.  A lawn spreader can be hired for use on larger areas.


In the south raise the cutting deck – long grass copes better with hot, dry weather. Further north you’ll wonder what the fuss is about! Carry on as usual…

Hoeing beds

Wiggle Hoe

Now is a great time to break up compacted soil in your flower beds and a handy tool to help you is this Wiggle Hoe from Suttons Seeds.


Sowing seed of sweet corn into individual coir biodegradable pots

Depending on where you live in the UK many seeds can be sown now. As Garden centres are closed, you should be able to order seeds online if you don’t already have a stock – Suttons Seeds is a great place to begin.

Only sow if you can protect your seedlings from extremes of weather and the ground temperature is above 5°c. Cloches, cold-frames, Enviromesh, fleece will protect delicate seedlings and keep pigeons/ birds/ rabbits off.

Clear weeds, tickle over the surface with a fork, rake out lumps, break up with the rake head laid flat with the ground and tamp up and down crushing the lumps.  Then rake to a fine crumbly texture or tilth.  A wooden scaffold board is now great to work off.  Create a straight edge where you want the row of the seeds to grow.  Stand on the board and use a trowel or the back of the rake and draw this along the side of the board edge creating a shallow furrow in the soil.  Now you can seed sow, there is so much choice from carrots, lettuce, radish, beetroot, and spinach.  Sow peas, broad beans, white cabbages, and broccoli.  Plant out onion sets and shallots.  Cover where you can with Enviromesh to keep bugs off.

RHS Enviromesh (4.5 Metres x 2.1 Metres)


Planting out potatoes

In the greenhouse, plant courgette, marrow, squash, tomato, cucumber, and pumpkin seeds.  Always use fresh seed compost and warm it up, avoid using cold, wet compost!   If you have a heated propagator you will achieve better and quicker germination, a great investment. Plant out potatoes, remember to plant at least 6” deep, adding potato fertiliser or growmore.  Potatoes are hungry plants.  Once the leaves come through be prepared to cover with horticultural fleece for frost protection. Others for seed sowing include cauliflowers, Brussel sprouts, cabbages, purple sprouting, broccoli – these all need a lot of room to grow, read the packets!  Celery, ridge cucumber, parsnip, climbing beans, runner beans, French beans leave until the end of the month and sow indoors.

Feeding and Watering

New growth on all plants shows the plants are growing so this is the time to feed any trees, shrubs, herbaceous, climbers, fruit bushes etc.

Liquid feeding works quickest and where you have a deficiency use a foliar feed like Vitax liquid seaweed plus Iron.

For established plants use Gro-Sure slow release plant food from Westland or 6X for a natural product. There are plenty of fertilisers to choose from.

Flower Garden – Sweet peas can be planted out into the ground or a large planter.  Put in bamboo canes or string supports to support and climb up.  Use a good quality compost for containers with John Innes No 2 and combine with multi-purpose compost 50/50 split.  Pinch out growing tip if plants are too tall back to 4-5 leaves.

Everlasting Sweet Pea

Bulbs – Take off faded flowers and the seed pod on the stalk especially daffodils.  If you want Snowdrops and smaller bulbs to spread leave them on.  You can dig up large clumps of Snowdrops and split them up into smaller groups.  Re-plant where you want to move them to straight away.

Dahlia Tubers – Time to check and pot up into fresh compost.  Any soft or rotten tubers need to be cut off and thrown away,  water and place in the greenhouse or a light windowsill.

Begonia Tubers – These can be started up again.  A tip I was given years ago is to place the corm on fresh damp compost upside down, convex upwards!  Leave like this for 2 weeks, and when you lift off the corm and look at the concave side there should be several buds – 3 or more.  Now you can plant them the right way up as usual, do let me know how you get on?

Garden Lillies – If you want scent go for the oriental and longiflorum types.  Great for summer colour, and plant in containers a handful of gravel under each bulb.  John Innes/multi-purpose mix again, placing it 6” down in the plot or plant in the ground again with gravel or coarse grit under the bulb. Water and feed plants in containers, and any newly planted plants.  March has been particularly dry and it looks like April will be too.

Plant supports and Training

Clematis, roses, climbing plants of all sorts need support, training or tying in. Don’t be frightened by pinching out the growing tip of clematis to make them bushier, if it means sacrificing the odd flower bud you will be paid back handsomely!

Use Pea sticks for herbaceous plants, they look the natural business! Just use any supports now before the triffids take over!

Peonies are a must. One of the quintessential cottage garden plants. Feed and water now for the best flowers. The Queen of Peonies is Claire Austin. If you love them as much as I do you’ll love her Book of Perennials. Website:

Happy Gardening everybody!

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Peter Mills

I love everything to do with natural history, wildlife, biodiversity and of course horticulture - basically the big outdoors. I grew up with very good teachers namely my parents and my French grandfather who was a superb grower of vegetables. At Hadlow College I studied a three year OND in Horticulture. I had a market stall selling plants. Went onto wholesaling house plants to florists and garden centres across southern England. In 1986 I joined Clandon Park Garden Centre as manager. Whilst there I started my career as a gardening radio presenter with the BBC Southern Counties Radio. This continued for 15 years, building up valuable contacts with the RHS Wisley, live broadcasts from Chelsea & Hampton Court Flower shows, South of England & Surrey County shows etc. Since 1998 I have been self-employed, working as a Head Gardener and in private gardens . Through the RHS Advisory Department at Wisley I advise on horticultural problems in members gardens, including pest & disease problems, lawn-care advice, pruning of wisterias, fruit trees, roses, wildlife gardening, growing fruit & vegetables, creating wildflower meadows, identifying plants and control of pernicious weeds. I am an extremely lucky guy who loves what I do and the trade called Horticulture!

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9th Apr 2020
Thanks for voting!
Help - my lawn in November was beautiful but slowly the grass had died. It's now now bare. We have leatherjacket (they turn into daddy long legs in September) by the thousands. They come out late at night. We sweep and hover up what we see but they keep on coming. The birds don't seem to want them.
Can anyone offer advice on how to get rid of them and what we should do to make sure they don't come back.
31st Mar 2020
Thanks for voting!
I think I've mucked up my spuds this year. They had chitted a week ago and I cut them up ready for planting. Then totally forgot about them. Planted out the pieces yesterday but they were black and dry. Ho hum. At least the shallots, garlic, onions & pea shoots are all doing well...

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